planning ahead for meals always makes sense, especially when you can't just run to the store and you have no refrig space to speak of, plus, its the anticipatory thinking that makes the trip funn start earlier anyway!
experience says that the best things i ever bought for our trips was a fry baby and an 8" electric wok, which make for really quick, really good meals
the menu is always seafood (you really should be completely sick of seafood by the time you get back home or it isn't a successful vacation!)
i have two small food coolers that zip together and has a shoulder strap:
one cooler with ice, holding bags of fresh or individual-glazed-fresh-frozen fish (mahi-mahi, red snapper and some tuna steaks), extra-jumbo shrimp and steak fries, bags of field greens and packets of salad dressings
and one dry cooler for fixins that has some croutons, tempura batter mix and a hand full of skewers, a bottle of seasoned peanut oil, tony catchere's creole seasoning, dried lemon peel, garlic powder, ginger powder, horseradish powder, butter buds, chipotle powder, paprika, bacon bits, toothpicks and some salt and pepper
another small bag holds a 4 cup electric coffee pot, some coffee filter packs, creamer and sweetener
i have found that these spices and ingredients allow for making pretty much anything that a resturant can and fits, along with the coffee bag, fry baby and 8" electric wok, into the easily carried container
its a real treat to work on your food capabilities, going on local picnics and things where you have to cook like you were in vacation conditions and getting it all down perfect before the vacation comes