Hi, the name of this tour operator is "Selvatica", formerly Selvatura (their franchise in Puerto Rico). It is located 15 min from Puerto Morelos direction west. One can take a taxi to there from Cancun or do the tour with a tour agency. The website of the operator is this-one:
The course is not very strenous but there are about 12 platforms and on each platform you need to manage between 10 and 15 steps. There is no rush for it, but it is not possible to skip any of the platforms since they are conected.
The cenote part is absolutely recommendable, a great jungle experience. Hope this helps!