A great place to swim is the pool at St. Edwards Park. It usually is less crowded than the city pools and in a beautiful setting. If you time it right, lunch at Bastyr rocks. I am about to head over there now. Pool and showers are warm, water has nice chemistry balance. It is run by the NW Center.

http://www.nwcenter.org/Downloads/En...rdWinter08.pdf

They have some discounted times too.