Did this at Mammoth Mtn, California, on a "day off" from climbing. You take the gondola up the mountain and let gravity do most of the work to bring you down.
Notes:
1) Gravity doesn't do ALL the work. You have to steer hard corners, deal with drop-offs, navigate through narrow sections, and try to stay upright.
2) Wear a helmet that protects your face as well as the top of your head.
3) Be realistic about what difficulty of trail you pick for your descent.
On Mammoth, I over-estimated either my skill or my courage. I walked several obstacles, feeling like a complete slug, while teenagers flew by like kamikazes. I crashed twice, once spectacularly: I was tearing through the trees at about 30 mph (?-- it seemed about that fast! I truly was tearing) when my front tire hit a patch of deep volcanic ash; the rear tire kept going, hurling me over the handlebars. I creased a few trees and landed like a sack of bricks. Well, I don't actually remember landing, only that geting up hurt a lot, and I was bleeding from 'way more places than the previous week of climbing rocks and mountains had caused. OK, I admit it, it was tons of fun. When I got down, I went up again. Most of the blood had dried.
4) Get a rental bike for this kind of work; it's a lot of wear and tear.
5) It tends not to be cheap (lots more than a Preserve day pass), but it's worth it (like a Preserve day pass).
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