No Borders - Far Harbor
If you're looking to expand your horizons, take a look at this extremely simple but extremely awesome mod from developer Bradenm1.
With this No Borders - Far Harbor mod installed, you won't encounter any borders around the island Bethesda added with the Far Harbor DLC.
With the borders removed you're free to roam around the unofficial part of the map. Who knows what you might find...
Unfortunately, there isn't a PS4 version.