I have been the foreigner using an unfamiliar terminal. Since it was a cruise to Vancouver, my cruise travel agent recommended I use a cruise message board for that city. I thereby got info on the whole range of options. Plus of course we could have used the cruise line's transfer (i.e. big ole bus) from cruise ship to airport. We hired a car and got a description from the driver of the places we passed through. Thus I learned to use such message boards as a starting point. Plus I learned to have contacts.