i like the glacial drumlin trail in wisconsin.
http://www.google.com/url?sa=t&rct=j...48705608,d.aWc
it's a converted rail bed from waukesha to almost madison.
from waukesha to dousman it's paved, 15 miles. the rest of the way it's crushed stone.
the nicest part about it is there are 3 rest stops with water and restrooms, waukesha the start, wales 7 miles, and dousman end of the pavement.
i live about 10 miles from it. it's a nice 50 mile ride for me from my house to dousman and back. the highway to the trail has a 3" section to the right of the fog line for a safe ride.
also if i feel energetic i can ride the glacial to the new berlin trail,
http://www.google.com/url?sa=t&rct=j...FOutAuwjZInV2g to greenfield park.
there is a connection there to the hank arron trail,
http://www.google.com/url?sa=t&rct=j...48705608,d.aWc, then ride to the milwaukee lakefront.
it's about a 120 mile round trip from my house to the lakefront, to dousman then back to my house. it's good or bad, depending on your point of view, there are almost no hills the entire trip.