Here are a couple maps of great rides. The first one is about 50 miles with just little rollers, and very nice roads. The second is a 100 miles, but you can see on the map that it's easy to make it much shorter by just coming back into town at a few spots.
I'll be around and can ride next week, I'll be working for the marathon on Friday afternoon, so I'll need to watch the time. I like to show off the riding here, and I may be able to save you some hassle finding your way around.
http://www.gmap-pedometer.com/?r=2757576
http://www.gmap-pedometer.com/?r=2549111