Star Trek was about people who lived inside of big machines (starships and spacestation), when these people wanted to play, it was often in simple settings. Kirk's idea of a good shore leave (with the occasional Cabaret) was basically a walk in a park like glen, fresh air and trees.
Ditto for Pike, who fantasized about an outdoor picnic in a grassy field, with a pretty girl and his favorite horse!
And in "The Naked Time," Kirk pines for a beach to walk on . . . .