I learned to unicycle at Tulane and enjoyed riding with the circus at Burning Man. I even tried out a self balancing unicycle.
The Trapeze School of New York has a great location on the westside greenway. In this video I do a knee hang catch to the other trapeze.
Swinging on the traveling rings at Swing City camp at Burning Man and working out on the rings at "Hudson Beach" in Riverside Park.