We haven't had a costco near anywhere we live so I'm not familiar with it. I belong to Sam's and all of their food items, fresh, frozen and dry are very large isn't Costco that way. Thinking beer, coffee, fish, eggs, etc. would be way too much for a weeks vacation?? Am I missing something?
We are planning to shop at Costco in June - but we have a party of 10 in a Grand Villa, so I'm sure we can do some damage on bulk food!
That said, for my family of 3 in a room with a kitchen, I'd still stop there to pick up:
Take-and-bake pizza (18")
Take-and-bake entrees (pasta, salmon, enchiladas, etc) (usually feeds 4-6)
Bread (usually 2 packs - I'd get their fresh baked)
Pineapple (each)
Fruit (I'm pretty careful about how I pick fruit - but berries, etc. for smoothies would be great)
Bagged salad (It's a 2lb bag - would last a week for DH and myself)
Water (1 case)
Wine (by the bottle)
Beer (6-12 packs)
Muffins/pastries (6-12 packs)
That should cover most necessities. I might get eggs - ours has 18ct Eggland's Best at a reasonable price, maybe some additional veggies, and stop at the grocery store for milk and deli meat/cheese.
I'd also look for snorkling gear - our Costco has adult sets for $40 right now. I'd also be on the look out for Hawaii-specific stuff (I know our Costco has dark chocolate coconut/banana snacks right now - sounds like a great snack for vacation!
). On the way out - pizza/hot dogs, drinks and frozen yogurt for lunch. With some planning, we could probably save a bunch on eating out - maybe enough to afford eating at Ama Ama!