I just saw your post and sent you a message! I too am researching tulum--the hotels are SO much different than any where else on the RM, and they are so my style =) I am also looking into Hemingway, Cabanas la conchita, Amansala, and Villa H20. I really like the Retiro Maya house and Posada Lamar, but theyw ould not be able to accomodate my 35-40 guests for the week. I look forward to hearing back from you! Hope you have an amazing trip =)