Total physical and mental inertia are highly agreeable, much more so than we allow ourselves to imagine. A beach not only permits such inertia but enforces it, thus neatly eliminating all problems of guilt. It is now the only place in our overly active world that does.
It's easier when you play. You get your emotion out. You scream. You yell. You do whatever you want. You play. But it's tough to sit.