Know Before You Go
Walk along the length of the lagoon to reach several public access points with great waterfront views. Here, you can negotiate with a boat captain for a ride to one of the cenotes or out to the "Pirate's Canal." Keep an eye out for wading birds like the stunning roseate spoonbill.
A few bucks will buy your admission to one of the "balnearios" (public clubs) for a swim or kayak paddle -- or a drink. Visit the "Fuerte de San Felipe" for an elevated view of the lagoon and a brief, pirate-centric history lesson.