Taking the time of year, holidays out of the equation, and if I had the ability to go any time I always prefer to go either Sunday, or Monday. It's usually the slower days of the week since typically most people who are on vacation are leaving Sunday, or Monday for the people who are local have to go to work, or school the next day. While obviously people are still on vacation as people are obviously at the park regardless what day it is. Most people if they're taking vacation time off typically aim towards the weekend. So if they start during the week usually they aim for towards the end of the work week (T-F).