How about the free "Try-Dive" at Portofino's on Mondays! It's in their new pool and Ecologic's equipment is brand new, which you can also rent to snorkle and dive. Otherwise, PADI and SDI offer their course work on line, which you can do from the comfort of your own home, then once you're here you can do your pool and your 4 open water dives for your certification.
Or the 1/2 day DSD course, like the TryDive, would meet your needs.