I vote for you just to go to Caye Caulker for the week!!!! LOL.
But really, my husband and I stayed on Caulker for a week in February and loved it. If you should decide to go to Caulker for a week, it is great. Nice people, beautiful island and the split....well, the split is awesome. We really enjoyed our week, I guess you can tell.
Whatever happens for you, you will have a GREAT time!!