I like to stay at Exotic Caye Beach resort. Go to www.belizeisfun.com.
It's a short 10 - 15 minute walk into town, depending on how many "refreshment" stands you stop at. Monkey Bites is located on site and is open from 7-3:00 daily (typically). Crazy Canucks is on site as well. Fun, fun bar that many of the locals hang out at. Don and Carol are the resort managers and are expats from Canada. They are super and will accommodate your every need.
Also, if you book now, I believe you will get a special. Go to their site and check it out.
There are a ton of places to stay in AC. Whichever place you stay, I'm sure you will have an awesome time. Go and live the dream. Perhaps you too will get the AC bug that has caught so many of us.
PS If you'd like additional pictures of the resort, email me at firstname.lastname@example.org. I'd be happy to share with you what I have.