I dive Belize around 2 times + a year. I thought is was great as a rookie, I generally love the ease of access, pickups at your dock in the am and dropoffs etc. ( was are talking ambergris Caye which is absolutely not an island) big on ambergris you are taking a $100 15 min plane back to the mainland to do nah hiking TD. Ambergris is diving and then driving around to bars/restos in a golfcart with a big thermos of cocktail in your hand..
Yo msy get out to the atolls once in a week. The turneffe is worth it, the blue hole is bucket list I wouldn’t waste a day doing it from ambergris. Spend a week on the aggressor, especially as a new diver. It’s perfect at that level. I love the atolls there and will always go back. Defo do it before Indo etc.
I always dive with Belize pro dive. Love them