Since you are only going for a weekend, the Cayman Brac Beach Resort and Reef Divers sounds like the easiest option because everything will be taken care of and you will only have to show up and sleep, eat, and dive!
Keep in mind that the Wait to Fly rule after diving will be a factor when planning your trip.
Thanks. I'll keep that in mind when booking the flight.
I may try going from Thursday and maybe return on Tuesday.