Helping a friend out. She is going to DW for two days but only wants one day to be park hopper. She is looking to just purchase a one day ticket and then an additional one day with park hoppers. Is there any reason why this isn't a good idea? She is not sure if she wants the park hopper day to be the first day or second. I suggested doing the park hopper day on the second day and just upgrade her second day while there but she is worried park hopper would sell out. Does that happen? Thanks