Want some inspiration? Read Lincoln's 1858 speech on the meaning of Independence Day: "Let us stick to it then. Let us stand firmly by it then." More excellent speeches from Coolidge (1926) and Reagan (1986). Video of the Reagan speech is here.
Journal of the American Revolutions' 10 Myths for the Fourth of July and Breaking News From 1776: First News Reports of Independence.
All about the Statue of Liberty.
Kaboom! 10 Facts About Firecrackers That Will Blow You Away. Related: PBS's description of various fireworks effects, and a quiz.
America The Beautiful: the story of the song.
When in the course of human events... here's the full text of the Declaration of Independence.
Have a safe and happy Fourth of July!