On my trip in Dec/Jan I spent an average of $150 a day which is high for me...but it rained alot so there wasn't much more to do than drink ; ), but that also included a cave tubing trip, catammarran trip, picnic trip to Rocky Point, a doctors visit after hurting my leg cave tubing and heavy tipping.
Usually on trips I always figure about $100 a day and have money left over and that includes tours, food and drinks, tips, souveniers etc....that way I don't have to worry about it and have extra cash in the event of an emergency.