The quickest way to demo games and linux is use something like Ubuntu and search the repositories for precompiled packages.
There should be plenty of things to keep you entertained for about a week. However, there are not many 3d linux games that kept me entertained very long. Alien Arena is probably the best looking and fun... as far as FPS goes.
Last edited by lumak; 01-17-2011 at 11:31 AM.