Well bigger than just the North Rock Creek trail, which stays east of Air Park Drive mostly. Anyway, needed a ride after Sunday's OG training session, so up to Lois Green, over to the north end of NRC and then south on North Branch/Kengla trails. And just because I could, the unintentional skills trail from 15.4 to 16.4. A real test of low speed maneuvering, tricky rocks, roots and multiple dead falls requiring dismount and lifting the bike over the logs. Also massive hill at 15.8, which required a short amount of walking after putting a foot down and being unable to restart in a very steep spot. Lovely fall evening, warm, with temps gradually cooling from around 80... Trails dry, hardpacked, fast. GPS track along Hadley Farms (mile 4 or so) has the sidewalk (where i rode) waaaaay off the road. Not true!