We camp a lot. We have to worry a lot about things staying cold here in TExas. A few things. Block ice keeps things colder for longer. Fill a few 2 liter bottles with water and freeze them. Add these to your cooler. It will help keep things colder longer. As an added bonus, you'll have cold water on your last day of camping to drink. Most things can be chopped and prepared ahead of time. I like to double ziplock bag things to keep water from leaking into them. (The outside bags can often be reused. Make and freeze ahead of time. Chilis and soups can often be prepared and frozen. Then when it's time to eat you are really just warming something up.
IF it's communal meals, is there any chance of compromise? Whole wheat pancakes and turkey bacon? Egg whites instead of the whole egg? Biscuit with preserves instead of gravy?
Some other meal ideas-
Fajitas. You can place chicken breasts in a ziplock bag with the marinade. THe veggies can be chopped and ready to go before you leave. Grill it up and put it all in a tortilla.
Grilled chicken sandwiches or wraps on whole wheat
Fruit is a great breakfast. You can also prepackage a healthy cold cereal. If you can get hot water, oatmeal is a great breakfast too.
White chili
Kabobs
Quesadillas are easy to make in a skillet. We make one here with chicken, zucchini and corn. The insides can be prepared before you go and then heat it up in the tortilla on site.
Salads can be made ahead of time. They may wilt a little, but it'll be fine. Make sure to cut the lettuce with a plastic lettuce knife. Metal reacts with salad and it will brown faster.
Bean and rice burritos. Just make the fillings ahead of time and assemble at camp. WE have found the snack packs of guacamole to be perfect for camping. They are smaller, so you don't have a huge open container to keep up with all weekend.
Grilled corn on the cob.
Grilled fish. A little lemon and dill. Yum.
Hobo dinners. We make ours with carrots, potatoes and ground beef, but those ingredients can easily be changed for other ideas
Grilled pineapple or peaches and baked apples are a great dessert option.
HTH! Have fun!