DL, Welcome to Scubaboard.
Please check out your local forum to meet other local divers and find out about local happenings.
NorCal - ScubaBoard
As for the FL Keys, here is a great sticky of info:
http://www.scubaboard.com/forums/florida-conch-divers/362149-florida-keys-guide.html
Although there is good diving in Key West, there is GREAT diving in Key Largo. Key West if very touristy with plenty of shopping, art gallaries, historical tours (Hemingway, Truman, Forts, etc.), the infamound Pub crawls on Duval St., as well as the street performers at sunset on Mallory Square.
Key Largo is a dive eat dive sleep kind of town. Lots of great diving (so many sites you can't get to them all in two weeks of non-stop diving) and plenty of great eateries. There are more dive ops in KL than gas stations, so there is something for everyone here...from shallow reefs to deep wrecks. You will have do some awesome diving. FL Keys is an oft asked subject, so do some searches and you will find plenty info on dive sites, conditions, dive ops, training, hotels, eateries, etc.
I have friends at many of the local ops, we all want to make sure you enjoy your vacation. So whether you dive with me or another op stop by to say hi :wavey:
Please feel free to contact me directly if you have any questions.