We have stayed at WL and loved this resort. There was plenty of light in our (standard) room and we NEVER saw a bug. I am sorry, but I can't answer your fireworks question. I would not hesitate to stay here if I were you!
The only bugs we encountered were the noseeums. I made the mistake of sitting at the edge of the pool at sundown without any OFF on. They usually are only bothersome at sunrise and sundown and sometimes not at all.