I haven't done the ATV Jungle Adventure in Cozumel but I did it in Playa Del Carmen.
I had a great time and, while it was hot, it was a fun and interesting time. If you love motorcycles, ATV's and going through some rough terrain and seeing more of the interior then this is a good excursion. If you don't like to get dirty/dusty or have back problems then this isn't an excursion for you.
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Upcoming Cruise(s) Carnival Liberty: May 31, 2014. The Anniversary Getaway.
"There is a great difference between being well traveled and just having been to many places." ~Me