[ArrogantBustard]

On those round-the-lake paths, 10mph is probably appropriate. In NoVa, we have an old railway converted to a multi-use path, as well as multi-use paths paralleling some of the major roads. They're wide, straight, and more suitable to high speeds.

[IYAS9YAS]

I'd like to invite you to try the Rails for Trails paths in northern Idaho...beautiful. Several tunnels and tressles. One tunnel is almost 3 miles long IIRC. Cost a couple of bucks to ride, but well worth it. Not a fast ride because it is a multi-use trail (pedestrian and cycle - unpaved). I'll see if I can find you a link.