I loved Mario Kart when it first came out on the SNES in the early 90s. I found the DS version to be just as fun - and far more portable!
You get both the classic racetracks plus a few new ones. You get a variety of kart sizes and styles. Go for the small, super fast kart, or maybe opt for the larger, heavier one. It all depends on your gameplay style.
In addition to the fun single player games, the DS wi-fi maeks it very easy to play online with up to 8 players! If you thought Mario Kart was fun zipping around against AI, you should try it against a few of your friends.
If you want a bit of thinking, there are a variety of missions that you can take on. You can gather coins, try to beat time limits, and so on.
I really appreciated that they didn't "touch screen" this to death. A lot of games brought to the DS go insane with touch screen features which make the game much harder to play. With Mario Kart, they use the lower screen for map information, which is really useful if you need it, but is nicely out of the way if you don't. It's the best of both worlds.
What's really great about this game is that all ages love it. It's a game that grandparents can play with their grandkids for hours and hours and really have fun doing it.
Buy Mario Kart DS from Amazon.com