I travel the MUP at full tilt but always announce myself when passing, I also slow when it is not safe to pass. I worry about scaring kids. What worries me is the roller bladers that cruise along with thier ears plugged with an MP3 player skating in the middle of the trail and making me yell to get them to move over.
I do feel sorry for the little girl and hope she is riding again. My daughter went over 2 years ago and has refused to get back on the bike - I keep trying to get her back out.