I just visited Tulum from the Ecstasy in Feb. It was an easy bus ride to the ruins and then we had about 2 hours at the ruins. The first hour was a guided tour. Our guide explained what the various buildings were used for and some of the culture and daily life of the city. The views behind the main temple or "castillo" are magnificent. As we were heding back to the bus, we had the unexpected pleasure of seeing the "birdmen". Men are suspended from a pole by ropes tied to their feet, then as the ropes unwind from the pole they descend to the ground. Really neat. If you would like to see my photos go to <http://www.clubphoto.com> On the right side in the box for invited guests type my email <email@example.com>.
Hope you enjoy whatever you decide on.