We had a wonderful dinner meal at Sanaa in January. I haven't tried Kouzzinna's so I cannot compare the two. Sanaa is beautiful, yet very comfortable and the staff was amazingly informed about the menu. It is on our do over list, but will probably try it for lunch just to have the chance to view the animals on the savannah during the meal.
By the way, I am a big fan of the Animal Kingdom as a resort (though Sanaa is actually in the new DVC side) and not a big fan of the Boardwalk area (grew up going to the NJ shore, so not very impressed with a replica). However, many people just love the Disney Boardwalk and it could be a pleasant place to spend your final evening.