Rommy
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Water on the sand, that's certainly amusing, but I wouldn't do it myself. For now, it's enough to have the main music theme accompanied by the sound of waves when you approach the water or are already on it.
Added 11 hours 42 minutes ago
I think that's how it works. The hero picks up the track from the last texture he walked on. The hero doesn't walk on water. He gets on a ship. That's why the track doesn't change. You could apply a water sound to any texture and add a few squares in front of it where the ship docks, and it would switch to water music. But you could also fill the entire map with that texture, not just in front of the ship. I looked at the ship file, but I couldn't attach a water track to it.