where to go in my b-day (16 years old)?!

So hey guys! My name is Frank and my b-day is coming up on sep 11th and i will be 16 years old. I will invite my 10 best friends.I've already been to paintball, mandarin,doing bbq in park, and etc. I need something special to remeber it my whole life any suggestions? please please please tellme where to go with my friends and btw i've got only $400 !! thx very much