A gentleman was "blowing" gigantic bubbles at the park and the kids were having a great time. They were trying to gently blow on them to keep them aloft or to create bubbles within bubbles. Or they popped them.
I am not sure who was having the most fun -- the individual "blowing" the bubbles, the kids, or the photographers trying to capture the action.
A note on the photo quality... I only had my little point and shot camera with me and the light level was pretty low. With a DSLR, more light, and more time, I imagine one can get some interesting images.