So happy for you that you are going! You'll love it. What is important for me when I go??
Do you dive? Do you get seasick?? Any chance at all you get seasick? If yes, call your doctor and get a scopolomine transdermal patch! They are about $12.00 each and one will last you 4 days! I am a big time serious diver and I would die without a patch when I hit the ocean. Talk about bringing in the sea life! Fish galore when your throwing up! (Pardon me for that talk. . .). In any case, if you go that route, you must have a waterbottle. Strap it to your body. . . the patch dries your mouth! Maybe you won't get outside the reef at all, but for me, that is a big item.
Also, a fanny pack or just shorts with pockets is key! You will be wearing very little most of the time. You will be really happy if you don't have to carry around a purse! (Oh my gosh, am I giving this advise to a man??). I ditch the whole purse/wallet thing and carry a "man's" wallet with me. Much easier!
Don't take more than one or two pairs of shoes! (Wow, if you are a man you are going to think this is the most useless advice you have ever gotten. . .sorry). You will be walking 95% of the time on sand or dirt, and you'll end up wearing the same ones all the time anyway. If your a girl, wear flats, you won't want heels!! If your a guy, wear flats, you won't want heels either!! Tevas are good!
Take a hat! The sun hardly stops! On the times I didn't bring a hat, I always had to go buy one. (Sunglasses too.). Maybe this stuff seems obvious. . . but it's important!
Bring lots of film. It's cheaper to buy it here. (I went through 11 rolls on my last trip. . .alright, I'll admit I'm fanatical about my camera, but what great pictures I have!)
A light jacket or zip up sweatshirt is always good. If you get a little crispy from the sun, being outside at night (and you will be out walking around) makes for a chilly breeze. . .
Take a book.
I'll think about this some more. . .
Oh, one more thing, go to the "popular bakery" and get a piece of bread pudding. Have it with your belizian coffee in the morning. Exceptionally fantastic!
You are in for a treat.
Where are you staying?