I think it's a good game played by some unspeakably awful social climbers.
Maybe true in some areas, but in Scotland it's still a game for the ordinary folk as it was originated. A lot of the best courses (e.g. St Andrews) are actually public courses run by the local council, so you'll see people walking their dogs across the fairway and old fellows with a half-bag of clubs out on their own having paid a few quid mixed in with the Yanks and Japanese. Its mainly outside Scotland that the game had been hijacked by the snobs.
Regarding the stamina, it's bloody knackering playing a long, hilly course (7,000 yards+) on a hot day I can tell you, and I usually take snacks with me if I remember. My game is so poor though I wouldn't have the nerve to blame nutrition for a bad round. The main thing about golf, though, is it's sheer, perverse masochism - you
never play as well as you'd like. Makes cycling long distances seem like a doddle.