Neptune is a big gas giant…so not much going on there for holidays :-P,… but quite a few spacecraft have gone beyond, like Voyager 1 and 2 and more recently New Horizons back in december 2015 – Have a looks at the stunning pictures there – https://www.nasa.gov/mission_pages/newhorizons/images/index.html
As a tourist destination for solar system tour companies, Neptune is a beautiful place to visit to take photos. There are also plenty of moons to land on.
It will be some years yet before we have such travel destinations. Mars is next.
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