Rent a pontoon boat from Woodlake or Brandermill, get out on the water and enjoy a relaxing evening on the lake. If you are not a resident of either then find someone at church who can get you a boat.
2. Backyard Water Fight!
This is for kids AND adults. Kids love it when their parents do crazy things. So, surprise them with a huge backyard water fight. Water balloons, super soaker, hoses, buckets, whatever can hold water.
3. Neighborhood Pool Party!
More than likely, someone in your group belongs to a neighborhood pool. Invite everyone over, grab some pizza and hang out.
Always tried and true. Round up some hamburgers, hot dogs, brats. Break out the cornhole and have fun being together. A great way to introduce your neighbors or friends you are trying to get into your group.
5. Segway Tour!
Must be at least 16 years or older. Segways are a blast to ride around and tour the city. There is usually a Groupon available.