I brought my MTB to Playa Del Camen so I would not just sit on the beach for 7 days. I had a great time riding with Cancun & Rivera Maya MTB Club. You can find more information at mtbcancun.com/ing/
There are no major hills here but it is hot and the trails can be very rocky and technical. We road through the jungle to amazing underground water hole called Cenotes and to Mayan Villages where the poeple are still living off the land.