The dive shop I help out at is the typical PADI shop...come in pay for the class and we send you hope with a "crew pack" go home study and understand the material (PADI shines here! They did real good with their material in easy to understand layout). Come in on a satuday for "knowledge reviews" and some demos... all easy stuff, then off to the pool for some skills. All non personal gear is supplies (personal gear you must buy which are mask, snorkle, fins, booties, gloves). Repeat this on sunday, deal with real world for a week then the next weekend we're out at Catalina doing the dives. Where we are we just make it a weekend. Get to the island go diving, have dinner hang out and crash at a hotel. Next day do a few more dives and go home as certified divers!
You can do...Im blanking on the term.... study and confined pool work at you LDS, go on vacation and do the open water part of you cert there... however I recomend against that as you are on vacation, why follow some guy around underwater demonstrating you can flood your mask and then clear it? Do the follow me dives at home, get certified, then go do the dives that YOU want, not what your instructor wants you to do.