Specifically request the Arusha Rock savannah, floor 4. Check in early, and if they try to stick you in the icky bird savannah, smile sweetly and tell them that you were really hoping to see giraffes, or gnu, or whatever in a polite but firm manner.

And take lots of pictures from your balcony!

Beware, they will tell you that you can see all animals from all savannah view rooms. "Polite but firm" works even better with leads.

I requested a Zebra Trail room, not too far from the lobby (due to me being hobbled by the marathon). I think that's the same as Arusha Rock savanna. I forgot to ask for an upper floor though. I may call back after I get my confirmation in the mail to verify my request. :) They will be transfering my luggage from Riverside to AKL for me. Woohoo!