SDC Holiday Building Hours – Make Us Your Indoor Recreation Destination! Published December 20, 2018 By Paula Olson Recreation News Make the SDC your indoor holiday recreation destination! We’ll be open special hours for a skate, a swim, or a workout in the gym! See schedule for specific dates/times. http://ow.ly/djD830n3ZEb #sdcholidayhrs #holidayfun ← Previous Post Enjoy the Winter Beauty of the Michigan Tech Trail with a Season Pass! Next Post → Wilderness First Responder Course January 7-11