Sounds like you have gotten some good advice, ridealot. As I also some from a no-bad-neighborhood-very-light-traffic part of the country, others will have to help you there.
However, as to the lack of showers, I have the same situation. One day a week I drive to work, and haul in a weeks worth of clean clothes so I don't have to pack all that stuff on my bike. I also keep towels and a washcloth in the mens restroom, so I can do a decent job of cleaning up using the sink when I change from my biking clothes to my business duds. That is what I do, I am sure you will figure something out as well!