Making Friends.
Everything else is some kind of work, and even if it's enjoyable work, itsstillwork!
But making friends, that's where it's at. This game has a pretty good friend progression and the heart events are all pretty good and blend well to the situation in the Valley. Plus you get to sit under trees, relax (or something...) at the spa, pick fruit, take in a music show, look through a telescope, watch gridball. Loads of great options.
... mmm what?
No! The fact that all that takes no Energy in-game is merely a happy coincidence!
Totally unrelated.
I'm going now...