Very true. I've learned that I need tight parameters for my creativity, and the Ringworld campaign setting.
Right now, I'm reading the Ringworld novel (Larry Niven) for the first time since my teens. A fun read. I was concerned after first reading Neutron Star (Known Space short stories), and some of the fiction in there didn't catch my interest.
But, back to Ringworld, the book itself is a focused exploration (at least thus far) of Known Space and the Ringworld. The protagonists remind me a lot of a RPG party.
So the book itself offers a template for a focused Ringworld campaign. If my interest continues, I'll have to continue on to the other books, which I've never read.