It depends on what time of the year you go, so you would need to check.
Sea World has Sea World After Dark which is a firework show, they also do special shows of Clyde and Seymour (funnier than the day time one) and Shamu Rocks (tons better than the Believe Show) on a night.
Universal do a 360 Show, this is a series of globes on water that show clips from films, with soundtracks, around the lake lights and lasers, special effects go off as well as fireworks.