Here is a brief list of attractions in the Playa Del Carmen area:

Diversity Diving: www.diversitydiving.com (sports camp/clinic;tour)
Alltournative Off Track Adventures: 52 984 803 9999 (tour)
Bali Club: www.baliclub.com/mx/ (bar/club)
Senor Frogs: (984)873-0930 (bar/club)
Boca Paila: www.bocapailamexico.com/theplace.htm (nature reserve)
5th Avenue: shopping
Aerosaab Tours: 011 52 984 873-0804 (tours)

More to come...