I'm going through the same thing here. But I have to keep 3 age groups entertained! What was I thinking? My kids are 13, 11 and 8.
So far, they want to do
1. the "Mummy Wrap" with toilet paper. (Break the kids in teams and they wrap one kid on each team with toilet paper. First team to finish wins.)
2. Find the candy corn in the whipped cream plate. Like a pie eating contest.
3. Donuts on a string.
4. Bathing cap toss: 2 teams, one kid from each team wears a shower cap that is covered in shaving cream. The other kids toss candy corns onto the cap. At the end of 2 minutes the team with more on their cap wins.
You could also do a pinata. Kids love that. I will probably have too many kids for that.
I'm hoping it's nice because they really want to play flashlight hide and seek and have a campfire.
Have a great time. Hope this gives you some ideas.