Angela
Jodi has a very good point, 3 dives in cold water, you are going to need something to warm you up between dives.
I am sure someone more tech than me could tell you how many calories you are going to burn to keep warm, from experience I just know it is a lot.
Eat like an athelete the night before your dive day.
Eat porridge or the equivalent for breakfast.
Warm soup, chocolate and bananas to keep you going during the day.
Personally I would not take my wetsuit off between dives, only the gloves and hood. I would take a balaclava or warm woolly hat and warm gloves to put on between dives.
Putting on a cold, and damp, wetsuit is on of the more unpleasant things in life. :icon10: Also the wetsuit stops evaporation from your skin keeping you that bit warmer.
Walk about to keep warm and the blood flowing through your feet, cold feet would be a nightmare to warm up.
If you get to cold. Stop, you can always get a referral to your dive destination in Belize and do your last dive there. It might cost a few dollars but it is better than having hypothermia 30ft down.
It will be worth it in the long run.