That's my house that you've wandered into.

Beyond that boulder is my hoard room, my place to just relax or have private time with friends. You'd need to be invited to get in, or else even if you got past the boulder, the security system I have inside will automatically throw you out.
Good thing to bring up though. Most of the plots of land outside of the club area are private homes that are being rented by people. An easy way to know is that they'll have a rental meter somewhere along the walkway next to them.
That said though. Nothing wrong with exploring a bit. Most people won't mind occasional visits from curious explorers, so long as you don't invade on private time, and are respectful to whomever owns that plot. And the people who do prefer to keep their place completely private will usually have some sort of security system in place.
As for my cave, guests are welcome in that first room. But yeah, beyond that boulder is private space.
