Amusement park goodie bags?

I'm having my 16th birthday party with 10 friends at Six Flags and I dont know what to put in the bags I give my friends who come. I want it to be practicle things that you would need at Six Flags so I'm gonna give them each a disposable camera and my mom wants to give them some shopping money but I feel like I should put more in. Also, were not allowed to bring in any food por bevarages so that rules out candy and a water bottle. Any suggestions?