The good thing about going away is usually the food. If you are going to a resort, there should be buffets with healthy choices like salads, fruits and vegetables, and probably fresh stuff, which is always nice. Any resort will prepare stuff for you the way you like if you ask them, so getting chicken, etc. probably shouldn't be hard. You can always ask for entrees without sauces, and keep the booze to a minimum. As for otherwise, take MRP's with you if you think you will need them. If you aren't staying at a resort, just treat it as if you are at home and grocery shop properly. Hawaii isn't really the ends of the Earth, so you shouldn't have a problem. Number one thing is to have fun and relax!