Currently, park tickets could be bought in a few alternative ways. Most folks have really already purchased park tickets specifying which days they plan to be within the parks. However, even these tickets have some wiggle room, so for those who purchased, for instance, a 3 day ticket beginning July 20, you even have a pair further days through which you should use all three days of that ticket. Now, it seems that company can be restricted to particular dates. Alternatively, by paying a premium you can make your tickets usable basically everytime you need.