Millennium Force is best to do first thing in the morning as the queues build up very quickly. It is an amazing ride, and the first drop is incredible. Millennium Force is a must-do as it is absolutely brilliant. If you want to ride it without a huge queue, ride first thing. Do NOT miss it! The feeling as you crest the 300ft hill and as you drop 300ft with only a lap bar is indescribable. The freedom your upper body gets is frightening. If you can't get to it early, I suggest you ride it anyway, it will be worth the wait.