Charlos & Charlies in Cozumel is a different experience in Cozumel than it is in Cancun. It is a large bar/restaurant that is very rowdy and tends to attract cruise passengers. They have constant contests, conga lines, group dancing, shot lines, all kinds of nutty things to embarrass people, and everyone lets their hair down! If you don't like to enjoy yourself in a loud, party type atmosphere, don't go there. We've always enjoyed watching the old ladies traveling together going "out on the town" and getting nutty, seeing the accountant that needs a stress release after tax season dancing on his stool and all the rest. The food ain't bad either! It is just a fun fun place. No, not for kids really, they are welcome, and they may enjoy the decorations and dancing during the day, but I'd take them out of there by 5 pm. We've really had an absolute blast there everytime we've gone. They have this "Sangria Squirter" that I can only describe as a glass bong type thing that they blow into one end and the customers get a stream of the good stuff squirted into their mouthes. (all while being covered with a large brown piece of paper). Tequila popper girls that mix tequila & 7up and yell and smashi it onto the table to make it foam before pouring it into your mouth and shaking your head. It's hard to explain, but if you want a little (or a lot) of fun and want to let loose a little, it's a great place. Don't get me wrong, you don't have to drink to have fun there. It's a GREAT place to people watch! Best part is it is right at the end of the pier where the Magic docks, so it is a great stopping in spot before reboarding. Last time we were there, we started talking to a 70+ yr old couple who said they were having the best time of the cruise there. They left to shop and 2 hours later they were back for more because they were having such a great time!
Many places will take credit cards, many will not (like smaller food stands, markets, etc) so you will have to be prepared for those types of things. I'm sure you aren't going to want to charge a couple of cokes and a conch fritter on your credit card. so, I would take some extra cash. & TAXIS!!!! Forgot about them. Need cash for them.