The advice to go there early is absolutely key. We did this 2 years ago in May and the animals were cool to watch. We entirely bypassed all the things to look at on the way in so that we could get to the far reaches of the park as quickly as possible.
We then enjoyed meandering back out. We saw the Tarzan show and the Lion King show. We also watched the bird show which was much better than I would have thought. My DD8 was picked to go up with the CMs and she loved it. DD has ZERO interest in the dinosaurs so we skipped it completely. (We went on another trip, and she despised the Dino ride, still talks about how creepy it was, and she is now almost 9!)
IMHO, AK feels the most crowded of all the parks, so the faster you can get over to the safari and then the rapids, the better. I think it is bc the walkways are narrower and they wanted to give the place a village-y feel.
Last year, we were going to skip AK completely, and changed our minds at the last minute. We got there in time for the parade, and sat in the nice cool shade at that BBQ restaurant. We sat in the upper portion, and while the view was not perfect, it was shady!! We then walked around aimlessly, having a great time having no plans, and then went over to the rapids where there was no line. (Most people were leaving at that point.) It was 90 plus degrees, and we ended up riding over & over again -- 5 or 6 times! - with another family. They just let us stay on since there was nobody there. They finally chased us out at 5:00 and we were among the last out of the park. As we were walking by the TTC, who should appear but Mickey in his safari outfit! Talk about perfect timing.