We stayed at AKL last year and I loved it! Be sure to try the night vision animal viewing - usually the guides can find something out there. Also checking out all the viewing areas is great. Bring your own binoculars for daytime if you have some small ones - we wished we had done that.
If you can swing a meal at Boma, I do recommend that. The dinner was really good and even our picky person enjoyed it. I found the buses to be timely and only crowded at the super prime times like rope drop or park close.
Most of all, ENJOY!!!