Assuming you have a wonderland of course. It feels like a good topic for discussion, as i'm curious to see what everyone else does for wonderlands.
Personally for me, it changes every so often, to bring something fresh and new. at the moment, my wonderland is a penthouse on top of a fairly large building, with basic necessities like a kitchen, bedroom, bathroom, living room etc... I don't like to create overly large wonderlands, as i just end up with plenty of empty space that i don't use, so small cozy places work best for my tulpas and I.