About 45 min. west of Madison, WI. Very nice park. 2 lakes, both allow swimming and small non-motorized boats (can use electric trolling motor). As typical with WI SPs, bathrooms/showers well-maintained. Multiple sections for sites. Some heavily wooded, others more open. Good screening between sites where we've stayed in the Cox Hollow section. Small playgrounds. Fishing, biking/hiking too. Twin Valley Lake parking area is wide open and a good site for stargazing. Staff allowed us to set up our telescopes for late night viewing. Rangers patrol at night and keep things under control.