Originally Posted by Morgie
it's not 50-100 but if you're looking for a 15+ ride think about the minute man bikepath in Boston. It starts from at the Alewife "t" stop and goes to bedford (10 miles/20 round trip) and if you wanna add some miles there are a couple sets of laminated maps of boston area ride that are sold in a bunch of LBS in the boston area, there are like 5-10 rides that start at the end of the minuteman path which could add 10-40miles to the path...
yeah, i ride that trail now and again too. its just a really easy way to work yourself up. my ride was usually around 33 miles round-trip. there are usually a lot of people on it during the day, but it's nice to not have to worry about car traffic and getting stuck on some ****ty strip highway. the elevation change is minimal because you are heading inland, but the return trip always feels faster.