If you need to keep your cat stimulated, consider getting it lots of toys. One of the latest cat toys is a robotic toy shaped like a slice of cheese. When you turn it on, tiny mice pop in and out of the holes, enticing a cat to swat them.
This toy has a built-in timer to run at 15 minutes at a time. That way it conserves battery power while giving your cat something to play with. If the toy proves interesting enough, you might consider playing with it yourself.