Tropical Lust

A shipwreck-or-fate excuse drops you on an island where every cove and cave seems to be hiding something, and the treasure isn't always gold. It plays it straight as a first-person adventure rather than a slideshow, so the mystery actually has to be walked through.

The setup is loose: you're stranded among locals and wanderers with their own reasons for being there, and the island's secrets tie into whatever it is you're supposed to be hunting down. It's an excuse for exploration more than a dense plot, but it's there.

Movement is the point. You wander the open world, poke around locations, and talk to the women you run into, with the sandbox structure meaning progress comes from exploring and interacting rather than clicking through a fixed script. The treasure-hunting thread gives you a reason to keep wandering past the obvious attractions.