As far as food, i plan on spending the same as i would eating out all the time at home. its probably a lil less, but then i eat a lot...
other spending, well you need to go at least snorkeling a few times, thats say $25 or $30 a person times 2-3 times. thats if you aren't a diver. dives are about $50 for a couple dives in a day. plus tips...
then gotta go dancing, sweat hard and dive into the sea, then return to dance floor and sweat hard again. hmmm. so a few drinks there.
trip to the mainland is really fun, say to Lamanai or Altun Ha. thats $75=$150 or so a person, depending on which one you go to and how long of a trip it is.
we like to get up north on the island and have a picnic at robles point, thats really fun. very remote up there...
well theres a start.