I would like to see some ruins while in the Riviera Maya but am not sure about spending the whole day going to Chitcen. Is Chitchen worth the whole day or would Coba be somewhat similar. I was thinking of renting a car and seeing Coba and then stopping by Tulum and Akumal/yal ku(to snorkel) on the way back. That way I get to do 3 things in 1 long day as opposed to only getting to see Chitchen in one day. Thoughts on Coba being somewhat as good as Chitchen?