I plan for $100 us per person per day. What you described is my day there. $50 us per day for food & drink, then $50 us for a "Tour a day." As an example a half day snorkle will be about $50, while a full day to mainland will be closer to $100, but will include some meals. Remember, [especially for the women]IMAHO bring half as much clothes and twice as much money as you planned. Then you can buy some local items[SHOES!] while you're there.