Passing place - the clue is in the name they are to let vehicles past. They are not for parking in while you go for a walk, have a picnic or look at the view!
Look in your mirrors! You may be on holiday and enjoy going along slowly to take in the fantastic scenery but other people have to get to work, school or have ferries to catch. Passing places are to let people behind you pass as well.
If the passing place is on your right then you don't dive across the road and into it. Just wait beside it and the oncoming car will go into it.
It is polite to give the vehicle who's stopped for your a wave as a thank you. Don't just glide past without a wave or your likely to get another guesture in return!!
They are usually marked with a sign saying passing place or sometimes just a black and white pole. Some are not marked at all but if you are on a single track road they are still passing places.