We were there for 1 week and we were so busy. You really need 2 weeks there if you want to get to even 1/10th of the stuff there.

I don't remember exactly how much stuff was. For Tulum we booked an all day trip to Xel Ha and then Tulum. You spend 4 hours or so at Xel Ha (where you can snorkle, scuba, swim with dolphins, etc.) and all food and drinks are included. Then you leave and go to Tulum where a guide walks you around for about an hour and tells you all about the history and everything. Then you are given another hour to walk around on your own. I think it was around $80- $100 per person which I thought was a good price considering it included everything. I think we ended up spending around $3,000 while were were there on top of the hotel. But our resort wasn't all inclusive so we went out to really nice restaraunts all the time and did buy a lot of souvenirs.

You should also look up Xcaret. It is similar to Xel Ha but I heard it is much bigger. We didn't get a chance to go but we heard good things.