Leaving another rut

Been sitting in Crete for over a month and I'm still wondering about whether the correct preposition to use is "in" Crete or "on" Crete. Intuitively, I feel that it's "on", but everyone else says "in". Doesn't really matter I suppose, as I've been put off wanting to teach English for a while, now that I'm finally qualified for that purpose. But I leave tomorrow.