I've only been once, but MGM was the park that least appealed to me if I had to choose one, I still liked it though, but it was very crowded. I think the heat/crowd level sometimes colours our views. The day we went to AK was by far the coolest of our holiday (sweatshirts needed for first couple of hours). That was purely by co-incidence, but I know it made for a much more comfortable tour. This trip although I have AK scheduled for Fri May 6th, I am open to swapping it with another day if weather doesn't co-operate (will get 10 day forecast night before we leave and keep eye on weather channel which I hope we will have in hotel)