As far as favorites go, I vacilate between MK and AK -- I just love AK!! My advice is to arrive early on a non EMH-am. You do not want your first impression of AK to be of crowds, and AK always SEEMS crowded even when it really isn't. Head to Safari first. The animals are so much more active in the morning. Then visit the animal trails before the crowds. When we visited in May, we had the animals and CM's on the trails all to ourselves at the beginning of the day. It was such a different experience from visiting in the afternoons!! Later in the day, you will find the trails way too crowded for photos or any sort of pleasure. I doubt you'll have to worry about lines at Dinosaur. When we were there last week, Dinosaur had a maximum wait of 10 minutes! Quite different from our summertime trips!!
Whatever you do, don't miss the shows. The Lion King is my favorite by far, but the others are quite enjoyable, too.
Take time to check out DiVine and some of the other performers. My 3 children always surprise me with how long they will stand and watch the performers. They really enjoy this aspect of AK.
If you like the characters, visit Camp Minnie Mickey. We waited less than 5 minutes to see Minnie last week. Mickey's line was slightly longer but not bad.
Have a meal at Tusker House. My picky kids love the rotisserie chickens here. The fruit salads at Flame Tree have fresh pineapple (yumm) in them. I had always heard such negative things about Pizzafari that we had avoided it until last week. I was pleasantly surprised by the good quality of the pizzas (but not the breadsticks -- dry and yucky!!). Before taking the closest available table at any of these establishments, scope out all your choices. I love finding a table on the lower level of the terrace outside Tusker House, by the goldfish pond next to Flame Tree, and in the very back room (although all are really interesting!) at Pizzafari.
Have fun!