It doesn't perform at you. That's the thing I keep coming back to. Some destinations know they're romantic and they lean into it heavily — every dinner has candles, every activity has a "couple's version." Phu Quoc just exists and lets you find the romance in it yourself. The Phu Quoc couple tours that work best seem to understand this — they set things up and then get out of the way. That's the right instinct.