You may want to request something on the Zebra Trail, or more specifically on the Arusha or Uzima Savanna. Since you will be there prior to them opening Kidani the first of May, a Sunset Savanna view might be iffy. The animals have currently been removed from the Sunset Savanna to prepare for the new Savanna, etc. and are supposed to be back on April 15th I think, but you never know if there might be a delay. If the animals have been returned you won't have a problem. We had a Sunset Savanna view when we were there over New Years and we saw lots of animals right near our room.
The problem is that you will probably be fighting a whole lot of people for these same requests, so good luck!