I wouldn't want to do a lot of cooking if I didn't have to on vacation, so I would stick with easy meals.
Pasta, sauce, bagged salad w/ dressing, frozen garlic bread would be one meal.
Frozen stir fry bagged meals (add meat or tofu), rice, and frozen egg rolls could be another meal.
Precut veggies for the grill, some sort of steak or chicken, and baked potatoes could be another meal.
Frozen pizzas (or the take and bake, which aren't bad at all) and bagged salad could be another meal.
Burgers/hot dogs on the grill, frozen fries, pre-made coleslaw is yet another meal.
Desserts could be ice cream, a cake from the bakery, frozen pie.
I would also get some bread, cold cuts, cheese slices, small jar of pickles, maybe some PB and Jelly.. things to make sandwiches. Grilled cheese and soup is a good lunch or light dinner option!
A variety of breakfast items.. instant oatmeal, bagels, English muffins, cereal. Bag of apples, some oranges and bananas, some grapes.
And a few snacky foods as well.. chips and dip, veggie tray, popcorn, granola bars..
Make a menu plan for the week, and write up a grocery list.
I like the idea of saving up small packets.. we have a TON of leftover packets of soy sauce, taco sauce, ketchup..
Something to keep in mind.. when we stayed in the condo our last trip, there weren't paper towels, garbage bags, cleaning supplies, or coffee filters. We drove and I brought things with us, but we did have to stop at the store a few times. In the end, I think we threw away half a gallon of milk and some leftovers that we didn't get to eat. The non-perishables we just brought back with us.