Something to keep in mind - any tour called a covered bridge ride...the bridges cross rivers in the valley. To get to the next bridge means you have to cross a ridge line. Yeah, that's a hill to climb to tp get to the next bridge.
I can recommend this ride:
http://www.cbbikeclub.org/?body=covered_bridge_ride It's in Bucks County, PA in October. I did it once on a glorious fall sun-shinny day - it was like riding in a stained-glass cathedral window with the sun shining through the changing leaves. Another time I did the ride on a rainy overcast day, still a great ride.