Bacalar chico- If you want an inexpensive trip try to get to Tranquility bay and snorkel the park from there. $5 dollar park fee if you see the ranger.Good burgers and beer at the bar.reef is close to shore at that point and your not likely to run into a lot of tourist.Some really great snorkeling.
Turneffe trips- the dive trips don't take snorkelers and don't visit the island. They stay on board even for lunch.
Carnival- not my idea of a good time sorry, I'm to old to run through the streets half naked, drunk and painting people!..however, when i was younger