I just got back from A/C on Jan 14th and we stayed at the Belize Yacht Club, they have 2 and 3 bedroom suites (they are not cheap! I paid $340/ per night for our 2 bedroom ocean front, but it was awesome!) As the Lainie said, you can't go wrong at Banyan Bay either it is very nice. The reason I chose The Yacht Club is that it was a little closer to town, if that is not important to you, you might want to check out the Victoria House also, they have a beutiful new pool there and it is a very classy resort. Check them all out at //www.ambergriscaye.com/pages/town/mapdowntowndetail.html
A/C is quite......very quite, but if you want to kick your heels up, you can do that too! Hope you have fun, can I stowe away in your suitcase?