For the Magic Kingdom fireworks, if you head facing the castle and take a right at Casey's, follow the path towards tomorrow land, as soon as you get past the area where the resturant is, but before you to get to tommorow land there is a bench, that is the perfect spot. Plus, you will get an upclose look at Tinkerbelle. However, if you think the noise will be too much for the kids you should try either the Comtemporary or Poly Hotels.