we did the tulum tour through
dcl. the ruins were fabulous. the trip there and back not so much. first, a high speed ferry from cozumel to playa del carmen. walk approx 1/2 mile to bus. 90 min. bus trip to tulum with a stop for bathrooms and, imo, a cheezy gift shop.
again, the ruins are fabulous. we went in june and it was very hot. the so-called beach break is very short and there is no place to change. lunch on the return trip is a subway sub, chips and soda. perhaps it was an authentic mexican subway.
on the ferry trip back a storm hit and all were seasick except me.
believe it or not the ruins were so magnificent that it balanced the unpleasant parts of the trip.
i actually suggested to dh that we rent a car and do the tour ourselves. he reminded me that we don't speak spanish, our cell phones won't work and disney won't wait for us in case of a problem. so i agreed to the dcl tour.
it was worth it to see the ruins but i cannot unconditionally endorse the trip because of the tranportation to and from and the mediocre, no lousy, lunch. even so, i would go with dcl. there is nothing to see on the way and practically nowhere to stop.
hope this answers your question.