Thanks for all the advice and tips!
We will be staying at Ambergris Caye so it sounds like there's some ideal spots to dive there for us. To be honest, I think we'd have fun in a frickin swimming pool being new to the sport and all, at least I think I will, so not pushing the limit should in theory be easy to do as long as we don't get pulled into a dive over our head due to circumstances or a yahoo DM.
My understanding of guidlines in self regulated adventure sports like this is that the rules are usually intended to encompass safety for an acceptable 'common denominator' of diver ability. So some new divers may indeed be able to safely stretch the rules a quite a bit and some new divers may be questionably 'safe' operating well within them. Having zero known ability in the sport and zero sense of my own limits within in it, I'll go ahead and stick to the rules until I'm sure I know where I stand.
The scary thing about scuba, as far as I can tell, is it appears easy to get too far over ones head (no pun intended) without immediate consequences or realization compared to some other adventure sports--then if something goes wrong, as it always eventually will, you suddently find yourself in some really really deep sh*t (again, no pun intended). So having hard limits in place, and always planning the dive and diving the plan will be key.
Hopefully I'll get addicted and start a path of self improvement in order to continue to enjoy the sport in the long term. Only time will tell, but I could see it sinking its hooks in me for a while at the least.

My poor credit card is already preparing for a good flogging. I saw it hunkering down in my wallet last time I checked.
