This is for those only that plan to go for more than one day. I went to Walt Disney World in October and discovered something new at the front gate.  They now have a new machine that registers your finger prints with your ticket.(  So you can not use anyone elses ticket)  How it works is you insert your ticket into the machine, make a peace sign ( those are the two fingers),  lay them on a platform and let it scan your fingers.  If it is a match, the turnstile will let you go through.  If not , it locks up and will not let you through.  I have seen on ebay people auctioning off partially used tickets with the idea that you can use the unused days. DO NOT BID ON THESE!!!! It will not work, you will not be able to use the ticket.  Also, important tip.... Make sure to write your name on the back of your ticket if you are with a group.  If you don't you will spend a lot of time at the gate trying to figure out which ticket was yours originally. Trust me, I had a group of  6 and learned the hard way.  Needless to say there were a lot of irritated guests behind us in line.