The specific link is rather long so just type Club med cancun in your browser and after getting to the Cancun site, just type excursions in the search space (upper right hand corner). This will show you a sample list.
However, Olivia sometimes changes the options. And certain excursions are planned for Solos. You book AFTER you arrive either on Saturday or before the days the trips are listed. Note that for the Tulum trip, you should wear bathing suit since there is nice beach to walk down (and backup!) a wooden stairway from the ruins.
The Ek Balam ruins are still open for climbing up on but not Chichen Iza. (have been to both)