I always calculate my budget for the trip and figure out what my daily food/drink/taxi/fun budget is. Once in JA, I change all my money to J's and split it up into daily groups... so for example if my daily budget is $60 US then I split my cash into groups of about $5040 J's. I paper clip each group together and put them in the safe. THen each day I just grab a daily group and hit the beach/road. That way when I run out of money on a given day, I know I am done for the day. If I have money left over, it rolls over into the next day. This way I never overspend early in the trip and run out of money/go over budget. If there is a special occasion (concert/fancy dinner/spa treatment), I allow my self to "borrow" from a future day if the event is early in my trip. This may sound way too planned out, but I am on a strict budget and this way, I dont have to try and do math/think/reason once I am in vacation mode (aka drunk).