Stayed here for 3 nights as part of our honeymoon in APril 2011. Great location. Was able to cycle about 20minutes along the coast (flat terrain) to Mayan Ruins. Old bikes available from property. Cycled up to tulum village which is 10 minutes, and on a town for grocery bits another 5-10minutes further. The beach by the cabanas is gorgeous, really long so ideal for long walks with lots of other small hostels & cabanas along the way to stop for food and cooling cocktails. There is a nice bar/restraunt less than 5 minutes down the road/beach towards thulium that has live music and nice food. Forget the name, apologies.
Only down side to La Luna was the extremely uncomfortable thin mattress. Don't know why we didn't say something. Staff were lovely and friendly. We got a private taxi there from cancan and when leaving to go to the airport. Forget the price but was def worth it and was easy to organise online prior to the trip!
Great memories of Tulum.