Mindswap — Robert Sheckley

In the future, interstellar travel to alien worlds will be too expensive for most ordinary people. It certainly is for Marvin, a college student who wants to take a really good vacation. And so he signs up for what he can afford, a mindswap, in which your consciousness is swapped into the body of an alien lifeform. But Marvin is unlucky, and finds himself in the body of an interstellar criminal, a body that he has to vacate fast. But that criminal consciousness has stolen Marvin's earthly body, and Marvin has to find a body on the black market.
Travel from world to world with Marvin, each one crazier than the last, as he keeps finding far from ideal bodies in awful situations, just to stay alive.