Depending on how long you are staying you may be interested in doing a half day/full day trip with the Barrakuda Dive Center. They offer snorkeling trips, cenote tours, jet skiing, and much more. Trips can be booked by phone or by the hotel gift shop.
Geoff and I went to this jungle spa in October off of the resort. Los Colibries can set up transportation for you. Highly recommend. Extremely safe. Very reasonably priced. Email to book in advance as spaces fill quickly. Email: valerie@loscolibries.mx