For boys: Hot Wheels Tiki Torcher playset
Although it hasn't gotten very favorable reviews, (the playset seems prone to falling apart) if you're looking to brainwash your kids by mixing tiki with their obsession with toy cars, this is really the only game in town.
Now at $9.99 on Amazon.com (half price), you can take the money you save and spend it on superglue to stick the track's parts together, which is how some parents have gotten around the problem. I've also seen this on the shelf at Big Lots!
Buy