Definitely read the other Hitchhiker's books. At least, the second one, which is as good as the first, if not better. Also, absolutely recommend the radio serie

Definitely read the other Hitchhiker's books. At least, the second one, which is as good as the first, if not better. Also, absolutely recommend the radio series. Even after you read the books, it's different enough to keep you entertained, and worth it for Marvin's lines alone.