You can grill meats and veggies. Our grill also has a burner, so we can cook rice, potatoes, etc on it. You can grill potatoes too, but it's best to parboil them so that they are paritally cooked.
Slow cooker--stews, pulled pork, pork tacos, etc.
Camp stove--Cook pasta, heat sauces.
Get a cooked rotisserie chicken, make sandwiches, salads, tacos, etc.