We were in Belize on a Navigator Christmas cruise. Since part of our large family group consisted of 6 children, we hired a driver with a van and went to the zoo. It was different from other zoos inasmuch as all of the animals were indiginous to Belize and it proved to be a lovely way to spend the day. If the driver can be found, his name is Edgar and we would highly recommend him.
As far as Santo Tomas is concerned, it was so hot that all we did was shop near the dock and stayed on board where it was air conditioned.