We have been to Cozumel many times and love both Chakanaub and Paradise Beach. When we take the grandkids, we go to Paradise so they can use the beach and water toys. This is a very nice place for all ages. You can go to their website and look at their prices and even their menu.
Chakanaub has coupons you can download from their website. Our taxi driver gave us info that saved us even more money at Chakanaub and it included a free tee shirt for each of us.
Once thing we have found out about Cozumel is to be very clear before you get into the taxi what the taxi fees are. Be sure that whatever you are quoted is for your entire party. Sometimes you get a quote and then they try to multiply the quote by the number of people in the party.
Been there - done that:
2005 Holiday, Sensation, Conquest,
2006 Conquest, Celebration, Holiday,
2007 Freedom Grand Med, Holiday
2008 Fantasy & Sensation,
2009 Fantasy, Holiday & Dream Grand Med
2010 Fantasy and B2B Elation
2011 Monarch of the Seas
2012 Booked - Breeze from Barcelona 12 days