Single track. the most difficult I have done is Freedom Park ( some irony in that name

) it's intermediate and I can't imagine doing more. I am brand new to MTB and just started over the winter. At one point I considered selling my road bike...but naaa.
I've ridden all of these and am lucky enough to have one close to home that kicks my arse as bad or worse than these listed below but because it's mutli-use it doesn't rate as a single track. Everyone that has come and ridden it with me agrees it's kinda tough.
I have not ridden Indian river in Chesapeake, to far and to much traffic to get there.
EVMA Trails
Beaverdam park
I'm riding an old heavy 26er (Specialized Rockhopper )that I get waxed by the guys on 29ers but I have differnt goals for riding MTB. I do love it though and hope to have a new hardtail 29er someday. I rode a FS 29er and didn't like the feel. I'm sure if I owned one and had a real chance to set it up it might be different. I liked the feel of the hardtail 29er i got to ride
----*Snip, slice, edit----*
Oh and I'm officially one of those "aged" riders and have to laugh....as the last few MTB rides I managed to leave the youngins heaving on the trial wondering what happened to them

Not to say I don't get my back side handed to me from the more experienced riders but I laugh every time I think about the youngins that are out to show me how it's done