I reckon you could get some really good foiling conditions over on north straddie, either at frenchmans if its small or deadmans/cylinders if it's bigger, cylinders to the beach in front of the pub would be absolutely epic!
Also the big ferry( car ferry) used to make a really long wave on its way over to straddle apparently some people have gone out with a boat, got themselves in the right spot and surfed it. That could be an awesome foiling adventure!
As far as sharks, I would say yes you should definitely be worried about sharks on North straddie