Intelligent movie.
The Big Kahuna answers "who says so" in regards to how we 'have' to live our lives. Later he realises "everything has a price" or in other words everything has a tradeoff (as in, there is no such thing as total freedom). This epiphany leads to him deciding his life as a surfer bum is no longer what he wants.
Also there's Moondoggie who clearly is intending to follow Kahuna because he admires him and Moondoggie is seeking a kind of status as a surfer bum as an alternate to his father's more conventional path to the acheivement status but it's still about status for Moondoggie and not a lifestyle choice for it's own sake as it is with Kahuna.
Even the whole Kahuna (almost) having sex with underaged Gidget thing is done well. Kahuna genuinly doesn't want to but he's not above doing it since she's kinda insisting and she's desirable. Then Moondoggie is critical of Kahuna for it.
There a few other things too but I don't want to get long winded. This movie is quite intelligent for a 1959 beach flick. One flaw is that Kahuna doesn't mention that while he's leaving the surfer bum lifestyle, he probably doesn't regret having lived it, values it as a lifestyle choice and would do it again.
I like waking up in the morning not knowing who I'll meet or where I'll end up: The Titanic