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.
There are artificial wave pools as well that some people use for waves
I've been in a few before when I go to the water park! Those waves would definitely work especially if they were a little bigger.