Yal-ku Lagoon is about 2 km (1 mi.) n. of town past Half-Moon Bay; take the marked Akumal exit off Mex. 307, stay to the left past the center of town and continue to the end of the beach road. Access to the lagoon is via a short, winding walking path. A brackish mix of fresh and salt water, Yal-ku offers the opportunity to snorkel in a sheltered environment (currents are stronger near the open sea).
Sets of stairs going into the water provide entry to the lagoon's sandy bottom. The water is calm and ranges in depth from 6 to around 15 feet, but due to poor flow clarity can be on the murky side. You will, however, see rock formations, underwater caves, the usual small reef fish, stingrays and turtles. It's a good choice for beginning snorkelers and families with kids. There also are sculptures and gardens on the grounds.
On-site parking is available. Showers and changing rooms are provided. Feeding the fish is not permitted.
Recreational activities are permitted. Food is available.