Have you read anything by Terry Pratchett? I just finished The Colour of Magic, the first book in the Discworld series. It reminded me quite a bit of Hitchhikers in its tone and style of comedy.
Terry Pratchett’s Discworld series. Like the whole thing. Can’t pick a favourite.
I would disagree with that. The last 3-4 books were... Not good. He was already showing signs of Alzheimers by then, and it was reflected in his writing. He died shortly after the final book, and, while it had flashes of his brilliance, it was clear that he was having a very hard time writing anything coherent by that time. Up to that point, he was fantastic. "Small Gods" is one of my favorite books about religion and belief, and he disguised it as comedic fantasy.
Fifthing (can't second) Douglas Adams.
Especially love the Dirk Gently books. Seconding Bill Bryson.
In no particular order: Donald E Westlake, Dortmunder series Dave Barry, Big Trouble
*Janet Evanovich, One for the Money and etc. Donna Andrews, Murder with Peacocks and etc.
Early Carl Hiassen