After being closed for a year and a half, the Papermill Creek Saloon, a beloved roadside watering hole in the woodsy San Geronimo Valley that prides itself on being “the best historic dive bar in Marin County,” reopened on New Year’s Eve. “I’m super excited,” said singer-songwriter Jeremy D’Antonio, who plays every other Sunday with a group called the Papermill Gang. The longtime centerpiece of the saloon, a playfully lascivious nude painting called “Pandora’s Box,” now occupies a place of honor above the bar. After listening to the Papermill Gang one recent Sunday, he ceased to worry that the saloon would fall victim to creeping gentrification. “To me, it kind of felt like the old Papermill.