Av. Javier Rojo Gomez s/n, Benito Juárez, Puerto Morelos, Quintana Roo, México
This is a guided tour that provides a hose for oxygen (which is connected to a distant tank) and takes you to a depth of 25 feet maximum. No certification is needed, so it's the closest you'll come to diving without investing the work or time of scuba instruction. This is a great family experience. Rentals and guides are available at Jeanie's Restaurant
and Parque Cankanaab.