Frisbee golf is an easy and affordable activity to do in the summer.
It's outdoors, in a park, and usually free to play. You could even
keep scores and establish handicaps so all skill levels can compete
with each other. It might also be a way to get them to meet on a
regular basis. If you need to find a course in your area, go to
pdga.com and click on the "course directory" button. I'd be happy to
answer any other questions.
Dan Bellrichard