Wii--I Want To Have Fun!

I have yet to play any Wii game, but I am dying to do so. I don't know when I will do that. I won't buy one myself, so I will need to use someone else's. I will probably have to wait until I visit my cousin this summer. Her children have Wii. I want to play. I want to play! I am not much of an athlete, but I might be a better Wii athlete! I will have to look into the system, how much they cost, etc., and what kind of Wii accessories are available.