The Dos Ojos Cenote is a two-tank two-dive (extra back & forth for the Bat Cave).
Both are Beginner Level - due to the fact that it's never deep, never long, and there are multiple exit points. It's beautiful, to be done at least once.
Due to it's location, it's nearer Tulum than it is Cancun, you will lose an entire day. We did it from Bahia Arkamel Riviera Maya and the trip to get there was nearly an hour.
IMHO it was worth it. Last tank out, with over 1500 psi left, we stayed in the pool for a long time having fun. I took videos and pics of the hermit crabs on the bottom. We practiced buoyancy.
Of course our Mexican guide, Lucio Flores, in spite of wearing 7m, boots & head cap, was out of the water ASAP. I found the water warm with a 3m, it was in the low 70's.
I think the best memory for me was the sheer thrill of it, scary, then after two dives, "piece of cake!". I felt like I had climbed Everest.