Is Koh Phangan worth visiting if you have zero interest in the Full Moon Party?

Almost everything written about the island is about one night, which leaves the other twenty-nine oddly undocumented. People who go for the quiet side end up on the north-east, and the reports from there sound like a different island entirely. Whether it suits you is not a fact we can source. What we can source is the coast-and-season trade-off that decides whether the sea is even swimmable while you are there: https://meetlocale.com/guides/andaman-vs-gulf If you went and skipped the party completely, what did you do instead, and would you go back?