Slacklines are popping up all over the place. The National Park Service worked with local "slackers" to create a slackline policy:
Did You Know?
Starting in 1907, the Yosemite Valley Railroad brought passengers bound for Yosemite Valley up the Merced River canyon to El Portal. From there, they would take stagecoaches to the Valley. Some of the old train cars are now on display in El Portal.