Bowled Over!
American Lawn Bowling originated in Europe as Skittles, but shares many similarities with indoor bowling most people are familiar with. Players setup 10 pins and take two turns per frame and keeping score through 10 frames, just like regular bowling.
Since you will most likely be playing on grass however, the balls being thrown can be bounced and throwing motion is a bit different. You can also try playing Skittles rules, included on the instructions sheet.
Its a fun variation on a familiar game thats fun for the whole family!