Arcade
If you playful pump it up/sky high (still fun when your 18)
Movie marathon
Lazer tag
Youtube themed party
Mini golf
Fair
That's all I got. Have fantastic birthday :)
How about going to a theme park, trampoline club thing or going to the movies.
If you want to stay around your house or do something free you could go for a walk to spend time with your friends. You could also go to the beach. If you don't want to do anything like that ask the guest's for their opinion, it may help.
I hope I helped you. Good luck.
bonfire?
There will be about 4 girls and a boy. I don't want to have a pool party or makeup party, but all ideas are appreciated! Thank you!