Wow! I go camping for the weekend; come back and there are tons of posts!
Took some of my sons friends camping. If you are in Michigan and need a campground for family activities or just to keep the kids busy then you can't beat the Port Huron KOA. It gets very busy and loud with all the kids around but there is so much stuff for them to do that they will be out of your hair all weekend. Thus you can just sit back and watch all the commotion! LOL
Port Huron KOA | Camping in Michigan | KOA Campgrounds
If you are doing the math: Hmm the two of you, your son, and three of his friends...thats six a bit tight in the Axis.
We made the kids sleep in a tent

Got a 6 person tent so the four teenagers slept out on some air mattresses in the tent. I think everyone was happy with that arrangement. They were free to stay up and giggle and talk of teenage talk and we were free to sleep

(When we dropped off the friends today they were all dead tired! LOL Their parents all thanked us

)
Had so much stuff to bring along we also filled up a car (I think the wife was happy to drive herself! LOL)