Nice choice!
What kind of package did you take? If you took one with drinks included you will get up to 3 non-alcoholic or alcoholic (house brand) drinks per day. They give you a card to present at the bar when you order drinks.
The package includes a lot of stuff, but be aware that anything you buy a la carte at the resort will have a 15% service charge automatically added, even a coke.
If you enjoy alcoholic beverages on vacation, another option is to pick up a bottle of duty-free liquor at the airport before you leave the US after you get through Security, and mix some of your own drinks. Each adult can bring in up to 1 liter duty-free. I haven't been to LCBR since they completed the recent renovations but there used to be an ice machine near the bar that guests could use.
But after you go through customs and immigration on Grand Cayman, you will have to pack your bottles inside your luggage before rechecking for the short flight to LC - because you will have to go through Security at GCM to access the departure lounge to board the commuter flight.
They have a nice little spa at LCBR and I always enjoy getting a massage while I am there. Your wife might enjoy some spa services while you are out diving, but the appointments fill up quickly so tell her not to wait too long to book.
If you search this forum:
Cayman Islands you will find a lot of information about Little Cayman and LCBR and Reef Divers, but it is really important to understand the nuances of the short commuter flight from GCM to LCM, see the links below for recent discussions on this subject:
Packing for the island hop with Cayman Air
Connecting to Little Cayman?
Grand Cayman airport update