If your are going to Mr. Sancho's, don't reserve through the Mr Sanchos website as they charge $55 ($5 deposit and $50 due at arrival). Use this one instead:
http://www.cozumelwatersports.com/ToursExcursions/MrSanchosAllInclusive.htm
It's $5 deposit and the remaining $45 due when you show up payable in cash. Make sure you bring your receipt as they have no records at Mr. Sancho's.
Connie - San Francisco beach is next to Paradise Beach. Mr. Sancho's is on the same side as both these beaches.
I noticed something has changed - the open bar looks like it has restrictions now.
Also an Open Bar of the following drinks is available:
Margaritas and Daiquiris: Strawberry, Tamarindo, Peach, or Mango
Cocktails: Mr. Sanchos Special, Iguana Rana, Mango Madness, Miami Vice, Sex on the Beach, Dirty Monkey, Ticket to Fly, Banana Mama, Blue Lagoon, Long Island Ice Tea, Cold Coconut (FAVORITE!)
Beer: Sol or XX (Dos Equis) Lager (import beer not included)
Sodas: Coca Cola, Sprite, Fanta, Fresh Juices/Waters: Horchata, Jamaica and Tamarindo
Other: Ice Tea, Bottled Water, Lemonade
(alcohol shots not served)