Definitely pick the operation that has the bright colored pink and yellow signs (both businesses have the same looking logos) towards the back. This place is full of treed areas and benches to get you out of the sun.
Get there before the crowds. They have 3 palapas which are the thatched roof huts for rent for $20. GET ONE! These are so cool. Full rooms with hammocks and tables and chairs and private entry steps into the lagoon. I could have stayed there all day, and basically did.
You don't need a tour and can do this without a guide. Rent their snorkeling equipment or bring your own. Lots of fish and even little mini caves.
The little cafe there is really good food. Limited menu. They describe the food as "fast food" hotdogs and hamburgers, but it's SO much better than that. The hot dog is big and comes wrapped in bacon with avocado on it. The burger is stacked as well as the chicken breast sandwich. Reasonably priced and convenient and really good.More