If your lookibgvto go to kentucky I would suggest black mountain ATV...great place and we had 6 banshees with us and we got around just fine...obviously there were some places we couldnt go but forbthe most part we were fine...it is legal to ride on the roads there also...
One note is being it is a bachelor party keep in mind that it is a "dry" county so they do not sell booze unless you drive a little ways...butvasvfar as the drinking is concerned we drank like fishes all week and nobody paid us any attention otherwise...just use your head about it...
http://www.offroadcoloradotrails.com/blackmountain.html