Hi Lynn! The Plaza restaurant in the Magic Kingdom is like a quiet secret for most. Many guests pass by that area never even realizing there is a yummy spot to eat just steps away.
Please note that although you might be lucky to snag a window seat inside you will still want to leave the restaurant for the best views of Wishes. There will be many people standing outside that will block your views so I suggest you arrive at the Plaza a bit early to put your name down, order quickly, then pace yourself during the meal so you can have time to leave and find the best spot outside for this great fireworks show.
I think this is a perfect spot for dinner....none of the other table service locations are where you can view Wishes so this at least will put you in place in the right area for best viewing!