Anyone know of any Wii games that would be honourable for a 4-5 year weak?

I have a daughter (about to be 6) and a son (just turned 4) they are very good gamers, but I don't want to obtain them anything too hard and waste the money renting it.

So far they like Mario Party 8, and Mario Cart.

Thanks to adjectives that answers :)
Wii play (kinda like wii sports) has lots of fun stuff
I just go to visit my niece and nephew and played some Wii with them yesterday. They are 8 and 5. They seemed to love Super Smash Bros. and they both like Wii Fit.
Answers:    If she can read then I suggest Animal Crossing. It's my 6 year olds fave game.
cooking mama and rayman raving rabbits

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