K.B.
The kids here loved the soda pop ring toss. I would use 20 ounce bottles instead of 2 liters. They also ove pingpong balls bounced into cups to win the prize.
If you have a tree or some way to hang it, you can drill a hold through an old bowling ball(free at bowling alley) and tie a rope to it. Then you bowl by pulling the ball back and letting it go. This is really fun.