As someone who never really fit in with the city, Flossie Wright let go of her worries and didn't bother to make an effort to blend in.
So...
She took Perry Reed on low-altitude parachuting and free diving.
Parachuting was something she had learned on her own and enjoyed the thrill of, while diving was taught to her by Perry, who at that time didn't know Erina Taylor's background and hadn't realized he also needed to teach her how to swim.
Low-altitude parachuting is an extreme sport, much more difficult than high-altitude parachuting, as there are only five seconds to open the parachute. It's quite challenging to adjust posture and movements mid-air.
Standing on a high building, Flossie shouted "three, two, one," and they both jumped straight down, tumbling through the air like in a straight line descent. People watching from afar screamed and were terrified, and then, their parachutes opened mid-air bringing their hearts back to their places.
