SeaDog's is a full-service fishing charter (they Bait the line, provide Fishing Licenses, Tackle and Fish Cleaning) with 4 different options for what kind of fishing you would like to do: Reef and Wreck, Gulf and Bay, Tarpon or Shark and Deep Sea. If you've never been fishing off shore in the Ocean, I highly recommend this activity.
Spirit Snorkeling of Marathon – provides daily snorkel trips to Sombrero Reef (third largest barrier reef in the world) Sombrero Reef Snorkel trip: $49.00 - Includes all equipment (Bring your own towel, sunscreen and sunglasses) Duration: 3 hours (approx) Departure times: 9:00AM and 1:00PM (check in 30-45 minutes prior) Call for reservation.
It's a very rewarding and educational trip while you're on the islands. If you love animals then I recommend you spend a couple of hours here. All proceeds go to the turtles and maintenance of the hospital. Open: 9:00AM - 6:00 PM