The best spot to see fireworks would be in the hub or in the area of main Street from the Penny Arcade to the Kodak shop on the same side of the street as the Kodak shop. You will be able to see everything and experience really nice snowfall. You will NOT get out of there quickly though. If that is a bigger requirement for you than a good viewing spot, then I would go ahead and try to find a spot without trees in the way at the end of Main Street, or view from iasw and then hop on the train after the fireworks - not sure how many other people will be trying to get on the train too though... I haven't watched the show from back there.