I got married on AC last September at the SunDiver (which is one hotel north of Captain Morgan's). It was wonderful! It was a small resort, and our guests, my husband and I had the place all to ourselves! You should check them out. www.sundiverbeachresort.com
They have several wedding packages to choose from.
Also, you can contact Iraida Gonzales at www.belizeweddings.com
She arranged everything for us (minister, paperwork, music, flowers, etc.) for a reasonable price.
You will LOVE your wedding in Belize! It was such an amazing event. We were going to go back for our 1 year anniversary in September, but I will be 9 months pregnant at the time, so we'll have to wait to go back next year. I miss it so much!
Congrats and good luck!