I have been thinking about this for a bit, but I am unsure as to what would be the best way to wrangle us into certain play spaces without breaking our immersive experience. Surely we will not encounter the infamous invisible walls, but I don't feel that natural borders, such as rivers, canyons, and mountains should serve as an impasse. We will surely come across many mountain ranges and bodies of water while exploring the solar system, it only makes sense that we will be able to traverse these geographic formations adding diversity to our environmental interaction.
The best scenario I can come up with is to be able to hop in your spaceship and get dropped off at one of the cities or areas of interest on Earth or on the other planets. From there you would be able to roam freely throughout that location similar to how Skyrim works.
Tell me what y'all think is the best approach to this, or what you would like to see.
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Probably invisible walls, so as not to obscure the sight of the beautiful, beautiful skyboxes further out.