Seahorse Water Adventures: Boat Rentals, Jet Ski Tours & More at Blackfin Resort
One of the biggest advantages of staying at Blackfin Resort & Marina in Marathon, FL is how easy it is to get out on the water. You don’t need to drive across the island to find a rental company or haul gear to a distant dock. Seahorse Water Adventures operates right here on the Blackfin property, giving our guests direct access to boat rentals, guided jet ski tours, snorkeling excursions, sandbar trips, sunset cruises, scuba diving, and custom charters—all departing from our marina.
Whether you’re planning a half-day fishing trip, a family snorkeling adventure to Sombrero Reef, or a sunset cruise with friends, Seahorse Water Adventures makes it simple. Walk from your room, check in at the marina, and you’re on the water in minutes.
Boat Rentals: Explore the Florida Keys at Your Own Pace
Seahorse Water Adventures offers half-day and full-day boat rentals for guests who want the freedom to explore Marathon’s waters on their own schedule. Choose between a spacious deck boat—ideal for families looking to cruise to sandbars, swim, and sightsee—or a center console with plenty of seating, well-suited for fishing, reef hopping, or exploring the backcountry.
All boats are well-maintained and equipped for a safe, comfortable day on the water. A half-day rental is perfect for a quick morning or afternoon escape, while a full-day rental gives you the time to venture further—out to Sombrero Reef, down to the sandbars near the Seven Mile Bridge, or up toward the mangrove channels around Grassy Key.
Note for renters: Anyone born after January 1, 1988 is required to have a valid Florida Boater Education ID card. If you don’t have one, Seahorse Water Adventures provides a link to take a quick temporary boater’s certificate test online before your rental.
Guided Jet Ski Tours: Coastal Thrills from Your Doorstep
If you’re looking for a way to get your adrenaline going while taking in stunning coastal scenery, Seahorse Water Adventures’ guided jet ski tours are one of the most popular activities available at Blackfin Resort. Led by experienced local guides, the tours take you along Marathon’s coastline where you’ll encounter native wildlife, cruise past mangrove islands, and enjoy panoramic views of the Florida Keys that you simply can’t get from shore.
The guided format means you don’t need any prior jet ski experience—the crew will get you comfortable and confident before you head out. It’s a great option for couples, families with older kids, and anyone who wants a high-energy adventure without having to plan a route or navigate unfamiliar waters on their own.
Snorkeling Trips: Dive Into the Coral Reefs of the Middle Keys
Marathon sits at the doorstep of some of the best snorkeling in the entire Florida Keys, and Seahorse Water Adventures provides guided snorkeling excursions that bring you right to the action. The team provides all the equipment you need—mask, snorkel, and fins—so there’s nothing extra to pack or purchase.
The waters around Marathon are home to world-class reef systems that are part of the Florida Keys National Marine Sanctuary. Sombrero Reef, located roughly six miles offshore, is one of the most celebrated snorkeling destinations in the Keys. This protected Sanctuary Preservation Area features a dramatic spur-and-groove coral formation with depths ranging from just a few feet near the surface to around 30 feet in the deeper channels. Snorkelers can expect to encounter parrotfish, angelfish, barracuda, yellowtail snapper, sea turtles, nurse sharks, and vibrant coral gardens—all in exceptionally clear water with visibility that often exceeds 30 feet.
Nearby reefs like Coffins Patch and the waters around Looe Key and the Alligator Reef Lighthouse offer additional dive sites that Seahorse Water Adventures can access depending on conditions. Whether you’re a first-time snorkeler or a seasoned underwater explorer, the crew tailors each trip to make sure everyone has a safe and memorable experience.
Sandbar Tours: The Quintessential Florida Keys Experience
Few things capture the spirit of the Florida Keys quite like anchoring at a shallow sandbar, wading into crystal-clear turquoise water, and spending the afternoon with a cold drink in hand and nothing on the agenda. Seahorse Water Adventures’ sandbar tours are designed around exactly that kind of day.
The crew anchors at a secluded sandbar, rolls out the lily pad, and sets up paddle boards for guests who want to explore. With music, sunshine, and the clearest water you’ve ever seen, it’s the kind of experience that people come back to the Keys for year after year. It’s also one of the best options for groups—the 49-passenger vessel can accommodate larger parties, making it ideal for family reunions, birthday celebrations, and bachelor or bachelorette weekends.
Sandbar & Snorkel Combo: The Best of Both Worlds
Can’t decide between a reef adventure and a sandbar day? Seahorse Water Adventures offers a combination tour that pairs both experiences into a single outing. Start your trip snorkeling vibrant reefs teeming with tropical fish and colorful coral, then cruise to a secluded sandbar to relax, swim, and soak in the scenery. It’s the best way to experience everything the Middle Keys waters have to offer in one trip—and it’s one of the most popular options for Blackfin Resort guests who want to make the most of their time on the water.
Scuba Diving & Surface Air Supply
For guests who want to go deeper, Seahorse Water Adventures offers scuba diving and surface air supply experiences on the reef. Explore the underwater landscape up close—swim through coral formations, get eye-to-eye with grouper hiding in crevices, and take in the breathtaking views that only a dive in the Florida Keys can deliver. Combined with the on-site dive shop services available through Tilden’s Scuba Center at Blackfin Resort, everything you need for a world-class diving day is right here on the property.
Sunset Cruises: Golden Hour on the Water
Marathon’s Gulf-side location means stunning sunsets almost every evening, and there’s no better way to experience them than from the water. Seahorse Water Adventures’ sunset tours take you out into the calm waters as the sky shifts through every shade of gold, pink, and orange. It’s a relaxed, scenic outing that’s perfect for couples, families, or anyone who wants to cap off a day in the Keys with something unforgettable. Bring your camera—or just put the phone down and soak it in.
Custom Charters: Your Day, Your Way
Seahorse Water Adventures offers fully customizable charter options for guests who want a tailored experience. Whether you’re planning a private snorkeling trip, a fishing excursion, a birthday party on the water, or a corporate team outing, the charter team will work with you to design the perfect itinerary.
Two vessel options give you flexibility depending on your group size. The private 6-passenger boat is ideal for intimate outings and personalized adventures, while the spacious 49-passenger vessel accommodates larger groups for parties, tours, and special events. Both options include experienced captains who know the local waters inside and out.
Why On-Site Water Adventures Set Blackfin Resort Apart
Many visitors to the Florida Keys spend significant time coordinating water activities—researching rental companies, driving to distant marinas, hauling equipment across town. At Blackfin Resort & Marina, that hassle disappears entirely. Seahorse Water Adventures operates directly from our marina, which means you can walk from your room to the dock and be on the water in minutes.
When you add up everything available on the Blackfin property—boat and jet ski rentals from Seahorse Water Adventures, dive shop services from Tilden’s Scuba Center, waterfront dining and live entertainment at Hurricane Grille, a private beach, swimming pool, and a full-service marina with boat slips—you have a complete Florida Keys vacation base where everything you need is within steps of your door. That’s a level of convenience that few accommodations in Marathon can match.
Book Your Water Adventure
Location: Blackfin Resort & Marina, 4650 Overseas Hwy, Marathon, FL 33050
Phone: (305) 897-0342
Website: seahorsewateradventures.com
Online Booking: Boat rentals and jet ski tours can be booked directly through the Seahorse Water Adventures website. Walk-up availability may be limited during peak season, so advance reservations are recommended.
What to Bring: Reef-safe sunscreen, towel, sunglasses, and a sense of adventure. Snorkeling gear is provided on guided excursions.
Ready to make the most of your time in the Florida Keys? Book your stay at Blackfin Resort & Marinaand step right into jet ski tours, reef snorkeling, sandbar parties, and sunset cruises—all from our on-site marina with Seahorse Water Adventures.