I would have included this in my other post, but as a new member of the forums, Stardock limits the number of replies in a thread, so I'm forced to make a new thread for this.
Does tourism depend on a trade rout? By that I mean, if I have a planet dedicate to tourism for income, do I need use a freighter to set a trade rout from my tourism planet to a neighbor to make decent income from the tourism on that planet? Or do the other races just automatically visit behind the scenes without my needing to direct them to the planet through trade?