A portable inflatable race track comprising a base, at least one wall, and a race surface, wherein the base is at least partially inflatable from a collapsed position to an inflated position, the race surface is inclined relative to horizontal and includes at least one lane configured to accept a vehicle comprising wheels, wherein at least gravity causes the vehicle to travel down the race surface. The race track may include a starting section, a sloped section, a finish section, and a stopping section. The race track may be configured to allow two or more vehicles to simultaneously race down the race surface.