As the title sez, been trying to find a good spot for some 20 minute intervals in the Seattle area and haven't had much luck so far. There's a nice stretch on Lake Washington Blvd. down to Seward Park, but that is only about 3.5 miles. I have other spots I've tried to piece together, and have some good loops like Golden Gardens in Ballard and Madrona Hill, but haven't been able to find anything that enables an uninterrupted 20.
Any Seattle folks have suggestions? Would've put this in the PNW forum, but it doesn't get much traffic, so figured I'd try here.