It seems silly and overboard, but I'm in the camp where interacting with all this junk is FUN (people's standards are "low enough" to buy into these pretend-band games already).
I already mentioned this idea once, but have some kind of driving action game where you can drive with the Wii Wheel, step on the gas using the Balance Board, and shoot up some foo's with a Zapper shell in the other hand.
Or split up those objectives to have a dedicated driver and a dedicated gunner on the same vehicle. Super Mad Max Kart. Resident Evil: The Highway Chronicles.