How do you find the circuits that are commonly traveled by those traveling solo? Im trying to go around the world, but I only seem to know major cities in popular countries.

My example is:

On a recent trip to Mexico I did the whole Cancun-Playa-Cozumel-Tulum thing. The other solo travelers with more time started in Mexico city, added an island or two, went to Belize and finally Cuba.

How do I find these common routes for Myanmar? Australia? Thailand? Greece? …