"Arranging your life around what you like" does not mean mindlessly overdosing on some activity. Essentially this piece is about a somewhat higher than average level of self-awareness.

The problem is, by constantly avoiding unpleasant things, one might lead a semi-happy life, but there is a downside: this way a large part of possible outcomes becomes simply unreachable. (There ARE outcomes, which can not be reached without considerable amount of unpleasantness.)

One might argue, such (hard to reach) outcomes worth more (= bring more happiness).

This is the real question here.