There is a surfski/canoe race taking place the morning after the Knysna Marathon (running). It's on the festival website.
Be exceedingly cautious paddling in and around the heads. The swell is very much dependent on swell and especially the tide, which can rreally pump through there. I wouldn't advise trying it without local knowledge. Maybe contact the guys at Knysna Racing Kayaks canoe shop and get their take on it.
