If you’re going by yourself, try Ambergris Caye in Belize. I like Amigos del Mar and you can stay at the Mayan Princess.
Tobago is also great. If you’ve never tried drift diving, I recommend it! It takes no effort and you use only a little air since the current pushes you. I stayed at the Blue Waters Inn in Speyside and used the dive shop next door. I was basically a single diver there and had no problems. I brought my mother but she doesn’t dive.
Bonaire might be tricky as it’s a lot of shore diving. There isn’t much organized diving and you would want to arrange to meet a buddy there before you go.