This Marathon combo pairs an hour of guided snorkeling at Coffins Patch Sanctuary with a relaxed stop at Grassy Key Sandbar. Expect shallow patch reef viewing, possible wreck remnants, and a family‑friendly sandbar with floats and clear flats.
More ways to explore the area's outdoor wonders
The boat slips away from Marathon’s low-slung docks and the horizon opens — shallow turquoise gives way to darker reef lines, and salt wind pushes an easy urgency through the group. By the time the captain radios the Coffins Patch Sanctuary, the water is already speaking: gentle currents nudging, patches of reef rising like crowded islands beneath the surface.
Difficulty
moderate
Duration
3–4 hours
Fitness Level
Moderate cardiovascular fitness and comfort in open water; must be able to swim and tread water for extended periods.
Wildlife
History
The Middle Keys reefs formed on Pleistocene carbonate platforms; Coffins Patch and nearby wreckage reflect centuries of seafaring and 18th‑century Spanish fleet losses in the region.
Conservation
The area is a Sanctuary Preservation Area—practice no‑touch snorkeling, use reef‑safe sun protection, and follow crew guidance to minimize impact.
Reserve your spot on the Marathon: COMBO- Snorkel & Sandbar (Coffins Patch Reef) today and enjoy a trusted, highly rated experience designed to help you make the most of your adventure.
Be a proficient swimmer
Operators require competent swimmers—practice snorkel breathing and treading water before booking; consider a snorkel vest if you tire easily.
Protect the reef
Use reef‑safe sunscreen, avoid touching coral, and keep fins clear of the bottom to prevent damage.
Dress for sun and splash
Light long‑sleeve rashguard, hat for the dock, and quick‑dry shorts help with sun, spray and wind between points.
Stow valuables dry
Bring a waterproof pouch for phone/ID or leave valuables in your car—boats provide limited dry storage and a restroom on board.
Snug snorkel mask
A properly fitted mask improves visibility and comfort while snorkeling the reef.
summer
Reef‑safe sunscreen
Protects skin and the coral ecosystem from harmful chemicals.
summer
Light snorkel vest or flotation aid
Provides extra buoyancy for less confident swimmers or choppy conditions.
summer
Neoprene reef shoes
Protects feet on grassy flats and when entering shallow sandbar areas.
summer