What to bring in your backpack on an hour long field trip (not electronic)?

[GuineapigLuva]

I need help like right away!!! My class is going on a field trip tomorrow and its about an hour and half away. What should I bring in my backpack?!?!I cant bring anything electronic! I'm already bringing a book! What else could I bring!?I was thinking of something to color on or maybe my homeWork but I don't really know! Do any of you people have any suggestions? I need help ASAP!!!!
My school allows Cameras.