I could only watch it with no sound as I'm at work, so can't comment on the audio side, some general observations:
Looks like a fun session, the action was all in frame and it wasn't too wobbly considering it was hand-held with such a tiny camera.
If you plan to shoot surf footage a lot I'd get a tripod with a nice smooth pan, and try and mix up the angles more, My favourite shot was the last one from the low angle, the light was really good and you were able to fill the whole wide-screen frame with the wave and rocks in the foreground.
There were a couple of different angles and if they were alternated more throughout the clip (same for left/right hand waves) rather than being bunched together, it would have kept the interest going a bit more.
The slow-mo was probably sync'd to the audio (stupid work computers), but I'd be more selective with any slow-motion clips, only the best shots should be slow-mo'd.
Also - with surf shots I normally stay on the wave for a few seconds after the rides over, it's tempting to do a quick pan back to the take-off spot straight away, but you'll be thankfull for an extra second when you're editing to music.
I enjoyed watching it, and look forward to seeing more, definitely a future in videography - especially if you get a nice tripod
Panasonic SD9, Panasonic NVGS-75, Canon MV600i