Going Camping, gonna be VERY bored, any ideas?

Tomorrow I am leaving for camping with me, my 12 year old sister, and my parents. We will be gone until monday, and it is supposed to be kinda rainy on friday and saturday. Basically what I have there already is poker, any card games, lots of board games, books, some movies on my dads work laptop if i want, sleep (obviously), and I can play on apps on my iPod touch. Do you guys have any other ideas for a rainy day? Or even for a good day? On good days I have everything I have on a rainy day but it also includes a beach shack with snacks, volleyball, bike rides (i am a big biker, like 20-30 miles a day, and I am only 14 :D) swimming (maybe not swimming, gonna be kinda cold) and shopping, drive in theatre and dinner on the town. Do you guys have any ideas that I can do withOUT my family? I am an artist, a tomboy, and I love water... lol, does anyone have any clue on what else I can do? I hate it like during the afternoon when I am bored, and time decides it is gonna take its time and not at all help me with my dilemma... :) Thank you :) <3