Earlier quoted context omitted.
I have no idea what Koh Lanta is like, but the world has 1.11 million km of ice-free coastline. I'm also not sure what tourist amenities are, but you can probably build them anywhere you want.
Build with what money? The whole point of even having tourist amenities is that there's a community that that's attempting to draw tourist money to their location, and probably create a thriving economy. An unknown tourist attraction with amenities is a failed location where the amenities are unmaintained/dilapidated, the local economy has nosedived, the young have moved out and the population is collapsing.
In the context of the discussion, I don't understand your question. The money comes from the hypothetical tourists who're hypothetically making all the usual spots too busy. What point are you making?