Tour de Letchworth
You get your choice on this one. The 20 mile version, and shortest route starts at the pool parking lot (you have to pay to get in the park) and follows the gorge to the south end of the park, where you turn around and follow the same route back. This omits the climb from the village into the park. Of course then you miss the downhill on the return trip! The second option (30 miles) is to start in Mt Morris and follow the same route, while the 45 mile version is a loop that follows the park south, where it leaves the park to return through Silver Springs and Perry on quiet country roads. Depending on the time of year, traffic in the park can be of concern. The park becomes hillier the further south you go. Also depending on the time of year, there may or may not be concession stands open.