I've only been into mountain biking for a few years but I'm going to go with hide and seek in the Sandy ridge trail system in Oregon. In particular the lower portion. It's a very nice flow trail with berms, rolls, and jumps that can be taken at a variety of speeds and skill levels.
I miss my old moto droid x2. Right size and I never had to worry about breaking a glass back
October 18 for anyone who doesn't want to read the article