Anyone here familiar with either Prospect Park (Brooklyn, NY) or Central Park (NYC, NY)?? Both of these large urban parks had motorways ringing them. PP was a 3(ish)mile loop and CP was a 6 mile loop. After morning rush hour in spring and summer the road was closed to motor traffic and many an aspiring racer put in training miles on these roads. It was about the only way to get some traffic free riding in without riding miles out of the city.

I've been in Portland for 10 years and haven't needed anything like the above. I lived in Washington County for 8 years and rode all the very fine rural roads on weekends. For the last two years I have lived right Downtown. I recently started riding a recumbent and I don't think I will ever be able to ride it in traffic. For the first time in 10 years I am looking for a big park with paved surfaces so I can do long (or short) loops without traffic. Is there anything like that around Portland?