I would say for me its 80/20. I race my buggy 80% with two of my buddies on his back yard track (well actually side yard). The other 20% is when I load my buggy up with me when I go out to ride my dirt bike. Usually I can find some crazy jumps out in the Arizona desert to hit. The most fun though is coming up in a month for Thanksgiving weekend (U.S., not Canadian -- different dates). We take our cars (and more importantly our dirt bikes) to the Imperial Sand Dunes in Glamis, CA. Theres nothing like seeing a buggy with paddle tires throwing huge roost and hitting jumps over the camp fire, or where ever else we dig one.

Except of course when you see someone out there doing it in a 1:1 buggy.
http://www.photosport.com/glamis/glamis2002tg.htm
(all 1:1 pictures, but awesome none the less)