actually, we did something similar to this on my mates stag night, but, we went to bed around 10pm (drunk) got up at 2am, then on MTB cycled through this town, up this huge hill, drank Whiskey.. then around 4am, under a huge full moon, coasted back into town. The 3 of us did this naked 
Really good letting your stuff dangle whilst zipping down a hillside, just thankful we didn't come off.....