So I was looking at the wave charts and thinking "oh wow, there's lots of waves out in the middle of the ocean"... and then I remembered there's such a thing as a floating dry-dock.
My idea was, what if you sail one of these bad boys out to wherever the waves are, point it in the optimal direction, and fill the ballast tanks/sink it so the interior of the dock becomes a temporary reef at whatever the ideal depth is for the waves at that moment? (i.e. 4-6 feet or whatever).
You'd need a pretty wide one to get a very good ride though... I dunno, what else could you use for a temporary mobile surf break that could go wherever the waves are?