in March, for the first time, we brought down 2 frozen steaks (packed with one of those flexible ice packs)- but as a treat to our Belizean friends who don't get it often.
for what it's worth, we left the house at 3AM EST, and the steaks were still frozen on arrival in SP.
otherwise, just what colomojo said - snacks, dry goods & coffee (note: you can't always GET caye coffee anymore), etc.