Organized by the National Mobilization Committee to End the War in Vietnam, the antiwar march from Central Park to the United Nations on April 15, 1967 was among the largest antiwar marches in New York history. Though estimates widely vary from 100,000 to 400,000 in attendance that day, participants included a broad coalition of civil rights activists, among them Martin Luther King, Jr., and an ideological spectrum of antiwar activists.
After assembling in Central Park for a peace fair, speeches and performances, the marchers walked down Fifth Avenue and then made their way east to Dag Hammarskjold Plaza at the UN. Though city officials worried about violence and mayhem, the march was peaceful, and the five people arrested belonged to the group of protesters who were opposed to the march.
The following newsreel account reveals the usual establishment sarcasm that's directed toward the protesters. In my opinion, marching with others for a just cause is a fine way to walk off the Big Apple.
See related posts:
"Walks Singing": The Selma to Montgomery March, March 21-25, 1965
Walking for Peace in Dag Hammarskjold Plaza
Also see the National Park Service website for more information: Selma to Montgomery Voting Rights Trail in Alabama.