The Knysna (the “k” is silent like in “knight”) Heads are some of the most dangerous narrowest waters to sail. Deceptively wide at 300 meters between the two headlands, but only 90 meters are deep enough for ships. The waters are rough. But only at the heads.
I recommend walking along the coastal walk, staying at one of the places with a view, and taking a boat ride. We did a sunset and cocktails sailing tour. Read more about the 300 million year old history (is that true?) of the heads here.
The ride out through the heads was rocky with waves up to six feet (two meters) and not good for those who get seasick.
The estuary inside is so calm that it seems strange after the violent heads.
I loved it.