Ports of Call Series by Jack Vance

Myron's parents insisted that he study economics, and Myron dutifully applied himself. But Myron had an aunt--his great aunt Hester Lojoie, a woman of great wealth inherited from a dead husband, and even greater flamboyance of nature. And when Dame Hester came into possession of a space yacht, Myron suddenly saw his long-supressed dreams of adventure bloom into new life.

Rejoin Myron Tany and the crew of the space freighter Glicca as they ply their way from planet to planet, star to star, and adventure to adventure. Each of them is there by chance, and each has a secret quest. From one world to the next, they will chase their dreams of revenge and fulfillment.

Two Books in One: Ports of Call & Lurulu