Now you are getting into the meat of camping out. First of all I am going with a friend, and we are bringing coolers of food. Entertaining oneself is not really a big deal because I will mostly be concentrating on not freezing to death -- that is entertainment enough. We are going in pairs, so when one of us needs to use the facilities we won't lose our place in the line. We are also going to bring an assortment of weapoms, personally I am bringing a bat and my friend is bringing a blackjack and a pocket knife.
If someone holds my place. no they won't demand a share because I will then do it for them. That is how it usually works, you group together with the people you around, in my case the people at the front of the line :-).