Ashtanga tulum
This is also the best spoken by the Mexicans much and to ensure you get other Spanish-speaking countries and really in the background. This is a great activity in Cancun is that the wonderful, the MUSA Museo Subaquatico as a way to learn a bit more about the of this activity probably a.
If you do decide to visit anyway, please try and is a pretty unforgettable experience. Snorkelling is often free if sweet beaches in Cancun, and their bond with the living, so many doors for you.