We're here:
http://grapevine7.com/hi-valley/index.aspx. Just up the road a few blocks is
this: http://eaglebikepark.org/pictures which in addition includes mountain bike
trails seen here:
http://eaglebikepark.org/trails/EagleBikePark.html. Beautiful views from the
top of the trail. So many obvious hang gliding training hills.