Ok, so here's the laydown.

Mongoose Riding

Sharpshooting

Avalanche

Ok. So there are the basics. Some more specific rules.

End with 8 grenades

10 checkpoints with the fastest time

Whoever gets the fastest time gets Recon armor.

Runner-ups get Jinx Clothing.

All you have to do is go to bungie.net. Under the tab Community you will find the People Finder, click on it, type in Mr Sark in the search bar, click on the avaible link at the top that links to Mr Sark's profile, then click View Service Record right next to his Halo 3 insignia and total games played. Once there, click File Share and then download:

Sarkathlon2-VIP(variant)
Sarkathlon2-Map(map)
Sarkathlon2-Tut(tutorial video)

Make sure to watch the tutorial video to see how it's done. Click on the links to download if you like going the simple way.

Oh, and NO USING HORNETS!!!!

Screenshots are from Mr Sark's file share. Enjoy!

Also view his videos,

Messy-Double kill, betrayal, and a suicide. Not bad for one laser.
Sarkathlon 1 Winning Video-Video of champion's run, DJ Maluus. This will show you that it's not as easy as it seems, and that there are other ways of completing the courses.


Oh, by the way, did I mention the prize was RECON ARMOR!!!!!!