I was only in Pheonix for 1 day on my way to the Grand Canyon. And it was 1 week after the iPad came out in the US, before they arrived in Canada so I spent most of that day playing with my new toy.
However, I did manage to visit the Pheonix botanical garden, which while it may sound boring, has 150 different species of cactus. I didn't know there were that many species!! Also, we went to Cooperstown, Alice Cooper's restaurant.
We passed Camelback Mountain, which I'm told has several nice hiking trails to the top. And there are 67 night clubs for drinking and dancing.