Sure. So you can commit to going nowhere without roads, or be willing to drive and camp places without them.

You can do a lot without designated and built roads, as buring man up to that point obviously demonstrated. If it wasn't constantly growing, they probably could have gone several years without another death

Basically anywhere you have dispersal car camping, of which salt flats are one example, even without burning man.

Also drive on beaches would be a good example.

Depends on the definition of "whatever" but car parks come to mind.

In Finland there are specific signposted pedestrian zones, where cars may enter but must not exceed 20kmh and must give priority to pedestrians (as must cyclists). They are typically the areas surrounding apartment building entranceways.

Suburban driveways are the obvious example. Adults park on them, kids play on them.

The internals of Barcelona super-blocks are mixed spaces, with cars expected to stay under 5km/h (i.e. ride the brakes and feather the clutch) at all times. Many old-city areas are primarily pedestrian with cars allowed as 2nd-class visitors. Agree that this is rare in the USA.