The AAA viewing area is the place just in front of the Plaza Restaurant, down by the water. It has tables with umbrellas and by day it's a smoking area.
I saw the fireworks there once years ago when it was part of a special offer I was participating in. It was a really nice view of the fireworks.
Be advised, however, that (I think) you have to have booked a package with AAA to take advantage of the viewing area, not just be a AAA member.