I ride mostly solo because the club rides don't start early enough for me during the summer. There are a couple of clubs:

http://www.tucsonbicycles.com/rides.htm

http://www.bikegaba.org/

The second one is fairly active. The first one is mainly just rides from the bike shop.

Noon? My goodness, you are a hearty one! If I'm back by 9AM, it's too late!