Whether you are planning your next big vacation, or you simply want to get away for the weekend in a place that has everything to offer, Southern Illinois is the perfect option. VisitSI is the official destination marketing organization for Williamson County and provides access to a comprehensive resource center in Marion, IL. We showcase the ultimate experiences and attractions that this exciting destination has to offer and will assist you in building the perfect itinerary so that you can get the most out of your trip in style.