Snorkel Sombrero Reef: Marathon’s 3-Hour Catamaran Adventure

Set sail from Marathon, Florida, for a brisk, three-hour getaway that drops you onto Sombrero Reef, one of North America’s most vibrant coral systems. Meeting at Fury Marathon and boarding Fury "Neptune" at Faro Blanco Marina (1996 Overseas Highway, Marathon, FL), you’ll climb aboard Fury’s 31-foot motorized catamaran and head roughly four nautical miles offshore. The boat’s open-air, shaded seating makes for an easy ride; note there is no bathroom onboard.

At the reef, the clear, shallow water reveals a tongue-and-spur reef structure stretching across more than 208 acres. This living barrier reef supports dense coral heads, sea fans, sponges, and schools of tropical fish. Guided by Fury’s crew, guests are fitted with a buoyancy vest, mask, snorkel and fins and given a brief orientation before a roughly 45-minute snorkeling window. Expect to float above colorful brain, elkhorn, and star corals, watch rays glide along sand channels, and spot the slow, curious heads of sea turtles.

Sombrero Reef’s status as part of the Florida Keys National Marine Sanctuary and as the only living barrier reef in North America makes it an exceptional classroom for reef ecology. The reef’s tongue-and-spur formations create sheltered grooves and undulating coral ridges that concentrate fish life and attract predators and cleaner species alike, offering frequent, close-up wildlife encounters.

After snorkeling, climb back aboard, rinse off and relax with complimentary soda and water on the return cruise. The trip is ideal for swimmers comfortable in open water; crew members maintain a safe perimeter and provide tips for conserving your air and energy while snorkeling. Groups are limited to 26; gratuity is customary and larger groups may incur an automatic service fee.

Practical details: complete digital waivers before check-in, arrive at the Fury "Neptune" slip at Faro Blanco Marina on time, and bring reef-safe sunscreen, a towel, and a light shirt for sun protection. Alcohol is prohibited, and the vessel has shaded seating but no restroom facilities.

For visitors to Marathon, this short trip delivers a concentrated reef experience that pairs accessible adventure with a meaningful window into a fragile ecosystem. Whether you’re a first-time snorkeler marveling at tropical fish or a seasoned observer seeking rays and turtles, the Marathon snorkel aboard Fury’s catamaran is a straightforward, memorable way to connect with the living reef.

On any given snorkel you’ll likely see parrotfish chomping on coral, sergeant majors schooling over spur formations, and nurse sharks resting in ledges—while cleaner wrasses and juvenile fish dart through branching colonies. The 3 Hrs excursion is paced for comfort: transit, gear-up, 45 minutes in water, and leisurely return leaves time for lunch in Marathon. For environmental care, use reef-safe sunscreens and avoid standing on coral to protect this fragile, living structure.