The term cenote can refer to a cave or a cavern environment. The cenotes on Cozumel are actually more caves and require full cave certification. The cenotes on the mainland have cavern zones which only require open water certification and diving with a full cave instructor/guide.
If you want to do the cenotes, I would recommend the mainland cenotes. Most operators on Cozumel either have cave guides and offer trips over there or have affiliations with cave guides on the mainland and can help you get it set up.
I also highly recommend Dennis of Diable Divers. www.diablodivers.com
If you want to do the cenotes, I would recommend the mainland cenotes. Most operators on Cozumel either have cave guides and offer trips over there or have affiliations with cave guides on the mainland and can help you get it set up.
I also highly recommend Dennis of Diable Divers. www.diablodivers.com