HI K., some of our favorites are tuna salad and all you do is mix 1-2 cans of tuna depending on the size of your family, plus 1-2 big spoonfuls of mayo(I'm talking just a large spoon from your silverware set) then 1-2 big spoonfuls of mustard and 1-2 spoonfuls of relish to taste and some salt and pepper to taste. You can also add 6 or so hard boiled eggs that have been chopped and you can cook those in advance in the morning and they'll keep in the fridge for a good long time. Not exactly sure how long but I just found some left over from Easter and they were still good!
I also love going to Foodnetwork.com and getting recipies from them. One I just tried and the kids loved was Chicken Salad and I got the recipie from there. When you do a search it will come up with all kinds of different chicken salad arrangements but the one I used was simply called Chicken Salad.
you can also do Sub sandwhiches homemade the way you like it, pasta salads straight from the box and add some tuna or crab meat or shrimp or chicken or hotdogs. I like cooking pasta salads in the morning so they can chill in the fridge all day, I like them cold.
An easy fruit salad is 1 can of Pineapple Tidbits with the juice, 1 can of mandarin oranges with the juice and 1 to 2 bananas sliced up all stirred together in a bowl. You can add more or less depending on the size your family needs.
Some good cold veggies are 1-2cans of sweet peas, 1-2 cans of chopped carrots, then a big spoonful of mayo with salt and pepper to taste.
Have burritos or tacos the only thing you have to cook is the meat which you don't have to add just use the bean sauce you can find with the taco shells at the store.
If you still want to use the grill you can cook almost anything on it. Beer can chicken is really good and you can find the recipie for that at the foodnetwork.com site as well as on the beer can stand which you should be able to find at Walmart or Target in the Grilling section. Wrap the grills in foil and you can throw anything on there, chicken, veggies, fish, pork chops, the sky's the limit for what you can do with your grill.
I hope this helps. Good luck and stay cool!