We know he enjoyed:
* Travel: He traveled extensively throughout Europe, experiencing different cultures and gathering information for his writings.
* Reading: He was a voracious reader, especially of historical texts and philosophical works.
* Writing: His most famous work, "The Spirit of the Laws," was a product of his deep interest in political theory and social structures.
While we can't say for certain what his favorite hobby was, these activities played significant roles in his life and work. It's likely he enjoyed the pursuit of knowledge and intellectual engagement above all else.