Well, I don't know how fun that would be, Flip (HI Cobra) might though!
He's quite a jumper himself.
Adrenalin? I might be passed that on my dirt bikes. I recall a couple of years ago 'racing' my son up a very technical rock and giant boulder hill, an old road long abandoned. Very tough climb, reaching the top (after several attempts and failure) I couldn't believe how GOOD it felt. Whew the adrenalin was pumping, I felt like I was a lion, a bear, on top of the world after conquering my prey. But alas, the next day I was hurting from all the spills I had taken BEFORE I made it. My boy as well, but he shrugged it off. Me? I was sore for two days.
Pretty well hung my Moto X boots after that run, I just can't do it anymore. But I remember the thrill of the boy, myself and the mountain on one glorius summer day.