My party idea is a survivor theme ment for 13yr olds. This is a good party for about 4-6 kids.For invatations use a thick black barker on brown craft paper.Then,once you have finished writing the invites smear REAL dirt on them!This part is a little expensive but really great for the feel of the theme.Rent a camp site for a night at a near by campground(you could also go to a cottage if you have one or just in your backyard).Tell guests to bring a sleeping bag and clothes thats all(and also a gift if its a birthday)!the firist "challenge" is to get up your tent before the other team.There is prizes that help you if you win ex.flashlight,pillows,and marshmallows!Next is a race to the flea market(campground shop)where each team is given 5 dollars to get other things nessary for "surviving".Race back to the tents and get all your items stored away then head to the beach!At the beach have an adult burry four item 2 matching buckets and spades.Show guests the area the hidden item are in and let them find them.Once they have found the buckets and spades the 2 teams willb dig a big hole the choose a member from the oppisite team the burry that team member who will have to get out faster than the other burried guest.After a the fun has been had down at the beach head back to the camp site for supper.Dinner can be hot dogs that each member has to roast over the fire!There are tons more games you can play too(but remember have fun)!