Surfing is the best.  I surfing everyday!
Surfing is a surface water sport in which the wave rider, referred to as a surfer, rides on the forward or deep face of a moving wave, 
It certainly is.  Where do you think the best surfing spots are?
Windsurfing which is done on the  surface water combines elements of surfing and sailing.
I think it seems too difficult for me.
The term "surfing" refers to the act of riding a wave, regardless of whether the wave is ridden with a board or without a board, 
I wonder how someone surfs without a board.
Skimboarding
Skimboarding (or skimming) is a boardsport in which a "skimboard" (much like a surfboard but smaller and without fins) is used to glide across the water's surface to meet an incoming breaking wave, and ride it back to shore. Wave-riding skimboarders perform a variety of surface and air maneuvers, at various stages of their ride, out to, and back with, the wave. Some of these are known as "wraps," "big spins," "360 shove-its
Surfing (disambiguation)
Surfing is a surface water sport in which the rider, referred to as a surfer, rides on the forward or deep face of a moving wave. Related activities include:
- Bodyboarding, water sport using a bodyboard
- Bodysurfing, riding a wave without the assistance of any buoyant device
- Kitesurfing, propulsion with a power kite across a surface
- Windsurfing, water sport combining surfing and sailing
Surfing may also refer to:
Activities.
- Channel surfing, quickly scanning