How about this for an easy-peasy weekend game?
My children got hold of our stash of empty tin cans this morning and began making towers. I found our beanbags and soon a game resembling both tin can alley (but without the guns) and ten-pin bowling (but without skittles or balls) evolved. It was brilliant fun with plenty of giggling and shouting, and lots of stacking...
... and Final Score calculating.
Warning: if you attempt to photograph your family playing this game you will undoubtedly get a beanbag thrown with precision accuracy - right in the face. Ye-ouch.