http://www.archives.gov/presidential-libraries/. From this portal, you can access something as basic as an interactive presidential timeline (http://www.presidentialtimeline.org/; please note: this timeline is not created by the National Archives but was funded by the National Endowment for the Arts) to a virtual tour of the White House (http://www.jfklibrary.org/). Students can hear the voices of some presidents. Teachers are rewarded with lesson plans that incorporate primary documents, artifacts and other resources. Virtual tours of each library are available as well.
http://www.firstladies.org/). Lesson plans are available based on a variety of standards and for a wide range of grade levels. The "resources" page is loaded with links on a variety of topics. A button for "facts & trivia" would make a great resource for a scavenger hunt or for creative questions for a quiz.