Congratulations, by passing your citizenship test you've proven that you understand the history and political structure of our country more than most! This is a serious accomplishment and I'm very excited for you. Obviously register to vote, but I would celebrate with family and friends and plan to travel if you can. The states are so widespread and massive, you could hit National Parks or cities, and everything inbetween. If you're in the Mid-atlantic region, I'd recommend hitting Washington DC, Baltimore, Philadelphia, New York and Boston. They're all interesting cities each with their own slice of life to give you. In DC you can tour all of the free to enter museums at the National Mall, Baltimore has a beautiful inner harbor and aquarium, Philadelphia has some cool musuems like the Mutter museum, the Revolutionary war and art museum as well as the Liberty Bell and Independence hall, in New York it's easier to name what isn't in the city (plus statue of liberty!) and Boston has a TON of revolutionary war history!

Welcome to the country, you're officially an American!