i recommend some Finnish Folk Metal
check out Finntroll, Korpiklaani & Ensiferum
also, u might enjoy some trucker/biker/stoner/sh!t-stompin' metal, like:
Five Horse Johnson, Sixty Watt Shaman, Dixie Witch or Halfway to Gone
ofc, some many years ago when i was into keggers and parties at the quarry we useta lissen' to Southern Rock:
Allman Bros., old Charlie Daniels Band (before "The Devil Went Down to Georgia", like back in the "Uneasy Rider" era), Marshall Tucker Band, the Outlaws, etc.
and of course, for true drunkeness, you could enjoy some David Bromberg, Tom Waits or really, really old J. Geils Band (way before MTV ruined them)