We were there 10 times this winter.
There are many things to do including theme parks, Xplore, Xcaret, Xel-Ha and more. In that area are several golf courses including famous Mayakoba the host of the PGA tour last fall. The town of Playa del Carmen offers shopping, dining and night clubs. We use Planet Scuba Mexico in Puerto Adventuras for ocean and cave diving.
Google is your friend.
Hidden Beach Resort is adjacent to El Dorado Seaside Suites.
Buy one way tickets for the Coz ferry.
Get pesos at a bank ATM.
More specific questions feel free to PM me.

check out my blog