Map of Lighthouses offering overnight accommodations
The map in the link above features lighthouses that function as Bed and Breakfasts, Inns, Vacation Rentals or Hostels, where guests can typically stay from one to several nights.

Map of Lighthouses offering "keeper" opportunities
The map in the link above shows lighthouses were you have the opportunity to serve as a "keeper." Depending on the lighthouse, you will stay either in the lighthouse, a keeper's dwelling, your own RV, or a nearby cabin, and your responsibilities may include giving tours, performing maintenance, and working in a gift shop. Payment is required to serve at some of the lighthouses while others are free or require membership in a sponsoring organization. The length of duty varies from a few days to several months.

U.S. Lighthouse trivia
Test your knowledge of U.S. lighthouse history.

U.S. and Canadian Lighthouses that appear in movies
Let me know if you have an additions.

U.S. Lighthouses with active Fresnel lenses
Shows all lighthouses with active Fresnel lenses sorted by state name and lens size.

Instructions for light-keepers of the United States
Instructions distributed by the Lighthouse Board in 1852.

Directions to the light-keepers of the United States
Directions distributed by the Lighthouse Board in 1852.