“There’s no shot around here – time to head home.”

[Mark Barendt]

7. Interesting location, excellent poosibilities, but no thing inspires you at the time

a. make mental note to return when the light or weathers better
b. return different time of day (or season)
c. return with different camera/lens (maybe a panoramic camera)
d return when in diferent frame of mind
e. return when there's far fewer people around

8. You get good shots but you return again because there's more to inspire you, possibly different weather, season etc.

I actually know a local guy who does this meticulously, going back to improve upon what he's done before. He may revisit his various and sundry tripod holes repeatedly for years on end. Sometimes he'll expose two sheets, one and a spare, sometimes nothing, sometimes serendipity gives him a fresh set of tripod holes.