When I'm traveling and am at a loss for how to spend my time, I look up as many libraries I can in the area I'll be traveling to, and I check to see if they have special collections. Then I make an appointment with the library to visit those special collections, and usually it means I get to spend a day in a quiet, climate-controlled room with cool old documents. It's like a museum but with no people, and where you have to do all the work, which is honestly my idea of a perfect vacation.