For night time shots, use 800 speed or higher. I took my manual camera last time and used 1000 speed at Illuminations. There isn't much light over the actual lagoon except what the fireworks provide. I still had to slow my shots way down which I can do on a manual, but you cannot do on most point and shoots with automatic focus, etc. If you use a flash, remember a flash has to bounce off of something to reflect that light back into your camera. Flashes are a waste in my very humble opinion for fireworks. I always laugh when I see outdoor concerts at stadiums at all the flashes going off from people light years away from the action. Waste of a good battery.

In the parades, you might get close enough for your flash to bounce and provide that light to the camera -- but you might be blinding a performer. Flash photography is prohibited for that reason in a lot of areas of DW -- can't remember if the parades carry that warning, too.
Even when it isn't completely dark, you should consider something faster than 200 for moving targets. 400 speed is great for times when you are shooting a moving target but have more light. 200 is usually great for everything else outdoors at DW. I usually use 400 inside. 100 for really really bright sunlight -- like the beach with the water reflecting the sun.
I also asked at Wolf Camera whether they recommended Fuji over Kodak. I was told (so don't hold me to this) that it is really personal preference. I think they said Fuji usually prints deeper blues and greens while Kodak typically develops with richer red tones. Really up to you.
Good developing is also important. I never send my expensive rolls (800 and 1000 speed) to Wal-Mart. It costs way more, I know, but you can also find coupons on Wolf Camera's website if you have one close by. They are the more "upscale" developer in our area. With that being said, I usually send everything else to Sam's which is really cheap.
OK--any others out there, please correct me. I am an wannabe photographer, not the actual thing yet. Have fun!!!