I teleport back from something and I see someone standing in the base of the tower:

Sure enough, it's a visitor. They were sent over to the islands by Radar to see where some other podcasters hung out.

Then Caleb and Yxes wandered over, we talked, and I took her over to Daphne's to worship at the Altar Of Many Boots.

Not that I mind surprises, I really ought to set a new landing point for myself if that's the 128,128 sim landing point.