Here's a way to have hours of fun with the kids.
Make your own racetrack to race the cars around.
Time to make: about 1 hour plus drying time - Cost around $4-20
Using indoor/outdoor carpeting from the home improvement store or a durable felt fabric.
You will also need sheets of paper, painters tape, a 9" roller for paint or textured surfaces.
Use your imaginations and buy some carpet and paint and cut your own style race track using the materials listed above.
If you prefer you can find a carpet racetrack online