Archer Pool is the closest lap pool ($1.50 per day):

http://www.tucsonaz.gov/...sandrec/aquatics.php

And directions:

http://maps.yahoo.com/...olla,%20Tucson,%20aZ

Nothing fancy, but it does the job for me! I have seen people bring their bikes in and leave them on the deck, but I'm not sure if that is normal. Otherwise it's less than 10 minutes to drive there.

Quincie Douglas is a little further, but it's VERY nice. Lots of lanes, very new and clean, etc. Also a city pool, so same entry fee:

http://maps.yahoo.com/...0st.,%20tucson,%20az

City pool hours will change a bit based on the season, but those two are open year-round. The other option if you are a Masters swimmer is to jump in at Ford Masters Aquatics at the U of A. Jim Stites will let visitors join practices for free! I would contact him directly:

http://homepage.mac.com/...dAquatics/index.html

General workouts and times are posted on that site also.