Best game for a 5 year old?

Anyone have any suggestions on what would be a good game to play with my son on a pc? Crysis and left4dead are a wee bit too violent.

But the real kiddie type game also bore him a lot. He likes world of goo, but its a bit too hard for him (well, a lot too hard, even though he managed to knock off a level alone).

Something with some eye candy would be cool too.

Suggestions?

Mario Cart style racing game

World of Goo? Mebbes you have a physics genius on your hands.

You could check out "Second Hand Lands". It's a fairy tale MMORPG, a parody on fantasy MMORPGs and fairy tales, in some ways similar to Shrek. You play as a wolf, sheep or a two-legged furball (squirrel, skunk, bear, cat or whatever). One of the most unique aspects of the game is that players can ride each other if one player is wolf/sheep and another a furball. You can kill things (piggy banks, princess pwnys and other hilarious stuff), save kittens in distress, help mafia boss Don Humpty Dumpty to defeat Salmonella, milk monkeys, gather resources for crafting, help seven gnomes to hold a decent tea party, raid boss monsters at higher levels with other players and do other stuff.

video trailer:
http://www.youtube.com/watch?v=J3PPdMK8hoA

Mario Kart for sure if you have a Wii.

My buddies kid loves TF2 as well. It is violent but at least in a cartoony way. He has been playing for 2 years since he was 5, only uses the W key and does really well.

Is his favorite class pyro?

Buy an old N64 for $20 - then find Banjo Kazooie for $5