as others have mentioned, plus...
- R/C cars
- Power Wheels
- Bouncy Castle
- Balloon Animals
- Face painting
- Coloring
- Learn how to make: Cotton Candy, Pretzels, Ice Cream, etc.
- Xbox 360 w/ Forza 4 or PS3 w/ Gran Turismo 5
- Quiz Show (Trivia) for family members (no Camaro owners) -kinda like Speed Channel's NASCAR Smarts, but about Camaros
- How-to's: Changing Tires, Oil, Wipers, etc. (for teens, spouses & significant others)
Anyone wanna volunteer guitar lessons 
Minus a rock climbing wall, these types of activities work well at the Jeep events that my company sponsors.