Ports of Call by Jack Vance
Myron's family insisted that he set himself on a course of sober education, the study of economics, and Myron dutifully applied himself. But Myron had an aunt - his great-aunt Hester Lajoie, a woman of great wealth and even greater flamboyance of nature. And when Dame Hester came into possession of a spaceyacht, Myron suddenly saw his long-suppressed dreams of adventure bloom into new life. The adventure begins with Dame Hester's determination to find, and take treatment at, a clinic reputed to restore youth to its wealthy clients. But space travel with Dame Hester is a difficult proposition, and Myron's life becomes almost unbearably adventurous when he quarrels with his aunt and she puts him off the ship on a remote planet, leaving him to make his own way across the Gaean Reach.