When we purchased our tickets for our trip we got the extra days instead of park hoppers thinking it would be better to take an afternoon break. I didn't purchase a day for our arrival day thinking we would do whatever. Now some of the group would like to spend the evening in the park. I know it wouldn't cost a lot to upgrade. My questions are do you have to wait until you use them the first time or can you do right before you go into the park? The other question is if you have to go in the park first will that cancel out another days fast passes? Trying to decide what we want to do.