90% of the time we stay in a studio because there were only 2 of us. Plus we don't do full cooking during our vacations anyways. That being said, I don't like to waste $ on park food on all our meals. So we always bring snacks and buy microwaveable or deli sandwiches fixin.
What I just found recently is (thanks to our kitchen renovation) microwaveable egg container thingy (yeah, really technical right?

).
Basically you need 3 or 4 things:
Eggs, microwaveable bacon (optional), cheese and bread of some kind (english muffin or just regular sandwich bread works as well).
First you microwave the bacon. Then you beat the 1 or 2 eggs in the container with the microwaved bacon (or you can leave the bacon out also, up to you) and cook it for about 1 min.
Then you make a sandwich out of the cooked egg/bacon, cheese and bread. VOILA! Almost like egg mcmuffin but cheaper
You can bring the egg cooker and bacon from home (there are 15 slices in a box - you probably only need 2 to 3 slices per sandwich) and buy the cheese, bread and eggs at the resort. You'll have good bfast for cheaper everyday. It's not gourmet but it won't set you back lots of $ either.
And for lunch you can buy some deli meat from the resort store or they have some options for microwaveable meals (not too healthy or a lot of options but they have some). We've done the deli sandwich and chips during lunch breaks and it wasn't bad at all. We get to rest in our room and save some $. We usually splurge during dinners tho.