The last time I ever had on rollerskates, I broke my right wrist. I was at a rink, holding onto the walls, and a worker at the rink yelled at me to get away from the wall. As soon as I did, I fell and there went my wrist. Never went skating again.
Bike riding is fun though. I found so many secrets in my neighborhood just by riding around. You see more on a bike than you do in a car.
As for skateboarding, when I was younger, my friend told me to try it. I looked at her like she was crazy. I knew I would fall off.