I'm playing through a seriously long winter (so far about 100 in-game days on a part of the map surrounded by water and high mountains, so very difficult to travel through), and chiseling and panning have been my main activities - as well as making a nice armor set to explore all of the deeper caves nearby. The days are very short right now, so I tend to do an hour or two of exploring in the morning and afternoon (mostly going out on the ice to harvest meat from all the foxes and rabbits that the wolves are killing), some panning, chiseling in the evening, and then lots of sleep.