I really enjoy surfing in all its forms.  That includes knee boarding, and surf matting
I do too, even though I've never tried it before!
It is a blast.  You don't even have to do it in the ocean.  You can actually surf in rivers and lakes too.
Oh you can? How can you do that?
Basically it is just like in the ocean.  Surfing means riding a wave, it does not matter if it is in the ocean, the lake, or the river
It just seems so hard to get good waves in a lake or river. Are they artificial waves?
Sometimes,  you can can use the waves created from boat wakes 
That seems like a viable way to get waves somewhere where they are so scarce.
Surfing
Surfing is a surface water sport in which the wave rider, referred to as a surfer, rides on the forward or face of a moving wave, which usually carries the surfer towards the shore. Waves suitable for surfing are primarily found in the ocean, but can also be found in lakes or rivers in the form of a standing wave or tidal bore. However, surfers can also utilize artificial waves such as those from boat wakes and the waves created in artificial wave pools.
The term "surfing"
attempt making the film, Gilliam said, "Oh, I don't know, pigheadedness, stupid – I really don't know anymore. I'm beginning to actually think, 'If it doesn't work this time, I'm gonna dump it.' I've wasted far too much of my life doing it. If you're going to do Quixote, you have to become as mad as Quixote. [...] I've wasted how many years? Fifteen? Yeah, there's a certain point.