Indeed a special day. Father-son hike-bike trip up at Black Rock. The four sets of groomed trails (rated easy to impossible) are about 3 miles in length and descent about 2400' --- BUT one has to ascend from the bottom in order to descend! It's every bit as enjoyable for me to hike/run as it is for my son to bike. Got some great pics and video. Link to Youtube video of this trek. https://www.youtube.com/watch?v=3NJv1_XlIbA
