From July 3, 1910
THE MIGRATORY NEW YORKER AND WHERE HE GOES: How the American Has Become a Wanderer Over the Face of the Earth and the Various Places to Which He Wanders (PDF)
Where did 1910 New Yorkers go in the summer? The New York Times Magazine researched 5,000 New Yorkers and came up with the above map and explanation of how people traveled by boat and rail.