re: Going to Cozumel this weekend

Rent a Jeep, head south and stop at every bar around the island, definitely hit Reggae's (Rasta's?) at the southeast tip of the island. About halfway up the east side you'll see a small peninsula jutting out into the gulf, stop and go swimming and the bartender from across the street will bring you drinks, continue up and over bar hopping. That's one day.

Snorkeling is good in Chankanab lagoon, better if you hire someone and head towards Puerto Morelos national park. Diving is great if you're certified.

A day trip to Playa has decent shopping but it's been Americanized (it used to be a quaint little Mexican town, now it's Cancun South). Coco Bongo at night has a good show but it's loud and runs till late so you'd overnight in Playa. The bars in Cozumel are usually real quiet until a cruise ship comes in.

Enjoy yourselves