I would take a vacation with an itinerary of only visiting libraries. So far on the ever-growing list...
  1. Beinecke Rare Book and Manuscript Library
    Yale University: New Haven, Connecticut
  2. Rauner Library
    Dartmouth College: Hanover, New Hampshire
  3. George Peobody Library
    The Johns Hopkins University: Baltimore, Maryland
  4. Stadtbibliothek Stuttgart
    Stuttgart, Germany