From the back cover:
"Meet Miro Hetzel, Galactic Effectuator. He's part gentleman, part detective, part fraud, and his trail of exploits cuts through some of the more improbable civilizations in the universe. Join him in a trip to the planet Maz, whose natives are so fierce that they'll fight three battles before lunch and then dine on the enemy - a planet that only a man with Miro Hetzel's steely nerve would dare to visit at all. "
That's only a minor aspect of the scheming and puzzles in this book. And there are other tourists.