And those are only responses to your selected sources. I could give a few aswell. Wiktionary: "The act of visiting another region or jurisdiction for a particular purpose" Tourism comes from tour which is "A journey (through a particular country)" Tourism is simply travelling to another place, sometimes for a specific goal ( a landmark you would like to see, or a pilgrimage) and sometimes just to enjoy yourself in another country.
If you are not convinced, just google: Is pilgrimage tourism. (in fact personally I think it is at the cradle of tourism, at first the main reason people travelled to other places that had religious significance)