Welcome to our forum.
Sounds great Anne. I hope you have a good time. FWIW: I have had good luck with http://www.tripadvisor.com/ the webiste reviews hotels, and areas of many many places. You have to read the reviews carefully and understand who is writing them,
Good advice for any online forum.
Anne, I was in Cancun years ago, before they ruined it!Tulum was beautiful, the snorkeling was great and we were particularly facinated with the ruins...Hubby rented a VW and we drove for hours through the rain forests...don't know what we were thinking...but we were young and really stupid...no concerns that we had no idea where on earth we were...Still it was all beautiful and probably the more you can avoid the "hot spots", the more you will enjoy the Yucutan. Have a great time!