Sounds like a nice cook out, and a nice choice for dessert. I've never made chicken on our BBQ, just steaks, pork chops, and ribs.
My current favorite for steak is to mix 1/2 cup of oil, 1/4 cup of soy sauce, and a teaspoon of vinegar into a shallow dish (pyrex cake pans work well), then take a steak and cover it in Montreal steak rub, then let it soak in the dish for an hour or two in the refrigerator.
Mighty tasty and juicy!
-JT