National parks existed before the system was formalized later in the decade, but city-dwellers flocked to outdoor spaces during the summer. In the Northeast, vacationers camped and hiked in the Poconos, Adirondacks, and the Delaware Water Gap, while the most well-heeled retreated to the rarified environs of Newport, Rhode Island, where the millionaires of the day had built oceanfront mansions.
With personal vehicles still a rarity, most long-distance travel was undertaken by rail or steamship, which limited vacationers of more modest means to outdoor spaces nearer their homes. Californians took to Lake Tahoe, Texans enjoyed the Gulf Coast, and the Great Lakes were destinations for much of the MIdwest-all by rail, of course.
Another popular tourist activity of the day was to hire a car and driver (typically available at railway stations) for scenic drives. From 1914, the First World War cut off much tourist traffic to the European Continent, and Americans stuck to North America for much of the rest of the decade.