Take your pool and classroom work in the US, get a referral to a dive operation at your destination and save yourself some scutwork on your honeymoon.
In fact, I recommend Cozumel (Mexico) over Belize - better dive operations, lots of things to do, better food, fewer sand flies and biteys. A good way to dive is
Aldora Divers - and they have a really nice villa with various accommodations on the north (non-cruise ship) side of town. All their divemasters are PADI instructors, they set you up with steel tanks, longer bottom times, computers, fast six passenger boats to get you to the best spots.
Yes, I have dived Belize (and Honduras, Mexico and ~40 other countries), a Master Diver with 56 years of experience. (Ah, heck, go to Bali!
)