If you have a bbq with a lid a nice alternative to chops, burgers etc is to do a joint of meat. The advantage to this is that it requires less supervision, so you can concetrate on your veggie skewers etc on the other barbies.
Try a deboned leg of lamb, or racks of lamb. Make a marinade with garlic, rosemary, lemon zest and sea salt - crush it all together in a pestle and mortar or blender and rub it over the lamb.
Or what about pork ribs? Rub racks of ribs with paprika, salt, garlic powder, black pepper, onion powder, cayenne pepper, dried thyme, dried oregano. Pour over a bottle of beer and marinate for a couple of hours. Remove ribs from marinade and bake in oven, tightly covered in foil, for 2 hours. Remove from oven. Smother with a spicy bbq sauce (homemade if you can) and bbq on a medium heat until ribs are nice and browned and sticky on both sides (6-8 minutes per side)
Sorry, don't have much to add to the already suggested veggie options.
Salad suggestions -
Tabbouleh - cous cous, loads of parsley, finely chopped tomatoes, cucumber, red onion, salt and pepper to taste and a squeeze of lemon juice
Brown rice salad with finely sliced red onion, green beans, red pepper, sultanas and fresh mint. I add a citrus dressing with fresh squeezed orange juice, olive oil, a splash of light soy sauce, brown sugar and a squeeze of lemon juice if it needs a bit more tartness.