Daniel Jackson: Hobbies
Daniel's work is his hobby. In fact, archaeology and linguistics are his life. He loves languages, books, translating, researching, and learning about other cultures and customs. At home, he lives surrounded by books, artefacts and culturally or historically significant art.
One pastime he does indulge in is keeping a personal journal for each of the missions undertaken by the SG-1 team. When Sam Carter read out a fragment of an early journal when Daniel was believed by the team to be dead, it was clear he began this tradition during the first mission to Abydos [1.13 "Fire And Water"]. Daniel's private journals are handwritten and contain both archaeological and personal observations, some, naturally about Jack O'Neill.
He rarely takes time off from the job, often working around the clock. What little social time we have observed him spending during the course of the series has been with other members of his team.