Thanks for the replies. My responses:
Carm - yes, I had already googled it. However, I asked the question on this forum because I value real opinions. I realize I don't "know" many people on this forum, but even though they're complete strangers, I'd like to know their opinions of what's fun in Flagstaff.
I got tired of visiting the google links I found (like flagstaffarizona.org). I kinda knew what was there but I wanted to know what others, who've been there, have found to be "fun."
blooz - it's a bit too early for the snakeys to be out. I do know that Az has some strict herp collecting laws. I would love to go look but not touch.

Ironically enough, the reason I'm going to Flagstaff is to pick up a couple of snakes for my mother. They're captive bred but native to Az, so our friend couldn't sell them - only gift them. So, gotta go pick up our gifts.
JEBB - of the 3 you mentioned, which would you say is the best one to visit?
Paul F. Hmmm, Bookmans. I will have to google that. Might be worth a visit. BTW, Paul, I met Clyde Tombaugh some time ago before he died. He lived in Las Cruces, NM (where I went to college) & he spoke at some honors dinner thing I went to. He was very nice. I'll never forget that. It's not EVERY day that one gets to meet a person who discovered a planet (in our solar system)!
zachdog, nah. There's skiing here in NM too. Although, this winter's been so dry that not many places have opened. Those that have are using primarily man-made snow.