There are some rocks, but close to the edge is clean. Water shoes are best if going to be waist deep (for an adult). You can use the snorkel equipment (fins and goggles) for 2 hours/day for free. Bring your own mouth piece or purchase one for $5. The area where the rock wall and trampoline are in the ocean are free of rocks. Dreams Tulum was an excellent resort. All of the kids in the Explorer's Kids Club seemed to be have a great time. They always had lots of activities going on.