Hey Grog, wow, are you a travel agent in your other life??? I love all the details and will now go figure it out and let you know. Today I drove down to the park on the other side of the pedestrian bridge at the exit just north of #8, which is my exit. I see these blue arches and they seem to be marking a path along there. I'm looking for a 20-30 mi route so one of these may work.

Thanks again, very helpful.