Since I cant find the original thread:
This game is cool. Way. Just in the demo, there's like 6 ways to beat this one tiny objective. Its fun to play. Also, just getting in the buggy and driving up the mountain is awsome.
In game, go to the left most beach you can without getting owned by helicopters. There should be a buggy there and a couple guys. If no buggy, just a busted boat, then you need to do this:
http://farcry.gamesweb.com/downloads.php?release_id=46
Download that, put it in your /levels/fort directory. Tada, dune buggy. Also more enemies, barrels, steam, lights, and no heli's to eat you.