Wow. It sounds like at the rate Denny is going, next trip everything will fit into his pants pockets! Seriously, thanks for all the great advice. Basically it looks like bug spray, (we are going to stay in the jungle for a few days) aloe, sun screen, several swimming suits, some T-shirts, very basic medical stuff (wife is an FNP so there will be a first aid kit) and most importantly, a laid back attitide!
One great suggestion is nylon pants for the jungle with zippered legs that can be removed for San Pedro.
We usually buy a stack of t-shirts at the touristy places where u can get 10 for $20. Something tells me that won't be the case in Belize. When the cheap graphics on them wear off, we know it is time to go somewhere else!