3 hours
Mobile ticket
Discover the vibrant underwater ecosystem of the Florida Keys on a Reef Snorkel Adventure to the renowned Sombrero Key Light Reef. Aboard the luxurious Marathon Mermaid, glide through the crystal-clear waters for an unforgettable snorkeling experience. This 3-hour excursion invites all ages to explore the colorful coral and diverse marine life, guided by a knowledgeable crew dedicated to your safety and enjoyment. After your underwater exploration, relax on the return trip while savoring fresh fruit and refreshing beverages, reminiscing about the aquatic wonders you’ve encountered.
Wheelchair accessible
Infants and small children can ride in a pram or stroller
Public transportation options are available nearby
Transportation options are wheelchair accessible
All areas and surfaces are wheelchair accessible
Not recommended for travelers with poor cardiovascular health
Suitable for all physical fitness levels
The ability to swim is necessary in order to participate in the snorkeling activity.
For a full refund, cancel at least 24 hours before the scheduled departure time.
Come out with us and snorkel the world's 3rd largest barrier reef! We will take you to the famous Sombrero Key Light Reef on the fastest, newest and most comfortable boat in Marathon! First, you will get a luxury ride aboard the beautiful Marathon Mermaid out to the protected reef to see first hand the beautiful ecosystem that the Florida Keys is famous for, using top -rated equipment. Then, after you have explored to your heart's content, you will get to relax on the enjoyable ride back with refreshments and beverages!
Soda/Pop
Snacks
Use of Snorkelling equipment
Gratuities
Barnacle Barney's Tiki Bar and Grill
1688 Overseas Hwy, Marathon, FL 33050, USA
This activity ends back at the meeting point.
21 reviews
Total reviews and rating from Viator & Tripadvisor
TGucci,May 8, 2026
- Review from Tripadvisor
Great experience and highly recommend the tour. Everything was smooth and easy and made for an enjoyable day.
K9410CZashleyk,May 7, 2026
- Review from Tripadvisor
Best experience ever! We went with our family of four and our friends family of four. Two kids that are 2 and two a little older. They all had a great time! First mate Mandy is hilarious and full of neat information about the area and her daughter was great with our kids showing them fish and playing along with them. While captain Dave guided us safely to our destinations, even turning around for us to view the hammerhead shark again that we passed by. 100% recommend this charter for snorkel and sandbar! You won’t be disappointed.


sandrabM5544CQ,May 4, 2026
- Review from Tripadvisor
The entire experience was five star!
cheryleM1433RN,Apr 30, 2026
- Review from Tripadvisor
WE HAD THE BEST TIME!! Let’s start with Lisa, the lady on the phone that I booked with. Her personality shown through the phone. We laughed the entire time I was booking the trip. Captain Dawn and her first mate Brandon were great! So very friendly and knowledgeable about the area. They got everyone’s snorkeling gear figured out and on the boat we went. We saw dolphins before we even left the harbor. They pointed out flying fish and rays and turtles. Snorkeling the reef was amazing. Knowing Dawn and Brandon where on watch for fish for us to see, to make sure we didn’t leave the safe area and to flag down rogue boats that wanted to drive through the swimming area, made it super easy to trust them. We had such a great time that before we got off the boat we booked a sunset trip for that evening. Brandon gave us the best local lunch recommend as well. They all helped make my daughter’s 30th birthday AMAZING! Thank you to the whole crew.

Seaside51267592807,Apr 27, 2026
- Review from Tripadvisor
Wonderful trip, boat was equipped well, Captain Kerry was great, as well as ….can’t remember her name. Funny, helpful, and well informed. THE FISH! So many different kinds. I lived in Hawaii, spent a lot of time snorkeling, this was probably better! Would do it again on my next trip to The Keys.
geoffreydN8073VE,Apr 24, 2026
- Review from Tripadvisor
I've done many snorkel and dive charters over the last few decades. And this, hands down was the funnest. Captain and First Mate were seasoned and knew their job well. Professional with the right amount of levity. We got lucky and the weather was perfect on Sunday, 4/19 as it had been breezy up until then. The Captain was gracious enough and allowed me to launch my drone for some aerial reef pics. Outstanding experience. I'll be doing it again next year.









Kauan F,Apr 23, 2026
- Review from Tripadvisor
The captions were incredibly nice and active with the crew!
W3396JZastridv,Apr 21, 2026
- Review from Tripadvisor
We had a wonderful morning with Mandy and the captain (sorry don’t remember the name). Extensive briefing, felt very safe the whole time. Saw some dolphins and turtles on the way to the reef, captain diverted to make sure everybody could see them. While playing music suitable for the occassion, hilarious! On the reef the crew kept a close watch for our safety. Crew made sure that everybody had a great trip but also made sure that nobody touched or disturbed the reef and the marine life. Well done!
Alexis C,Apr 19, 2026
- Review from Viator
10/10. The crew was knowledgeable, personable & kept us laughing the whole time. Good music, great rain playlist. Will be back
pattybushey1,Apr 19, 2026
- Review from Tripadvisor
Fantastic experience! Captain and guide were so helpful and informative. A must do for your trip to the Keys!
Operated by Marathon Mermaid Charters