I grew up 1/2 hour away from there. It's a wonderful place. Check out the Wenatchee, Methow, the Entiat, Chewach. Not very far is the Grande Ronde in Oregon and of course many rivers on the west side. There's a link on here somewhere showing when they let water out of Lake Chelan for rafting/kayaking the Chelan gorge - it was awesome. Spokane area does have a lot too.
If you lean over to watch the river slipping slowly away beneath you, you will suddenly know everything there is to be known. Winnie the Pooh