You've got a great attitude and you're going to have a GREAT time!
Arusha Savanna is the best
I wouldn't make any requests on-line. But that's b/c I haven't had much luck w/ it. I use on-line checkin only to be sure I have a room ready when I am arriving early - but I've gotten pretty lame views. (Having a room ready is not guaranteed, of course, but it has always worked for me.)
You might call and ask for Zebra Trail to be added to your res. (same side of resort as pool and restaurants)
If you don't want to have to walk much within the resort, ask for/select "lobby level" (3d floor) and/or "close to lobby". Otherwise, let the AKL gods place you and if you really don't like your room, ask to be moved before calling for your luggage
Good luck and have a blast!