RENSSELAER FALLS – Nature Up North will host a nature walk at Indian Creek Nature Center on Sept. 21 from 3-4 p.m. Recently, the DEC built a new observation platform for Indian Creek Nature Center (ICNC) and the group will be checking it out. Dan French will lead the nature walk to the observation platform on the Boardwalk Trail. This is a flat, one-mile round-trip trail that features a boardwalk through the marsh, woodland environment, and an outlook onto the marsh. The walkers will look and listen for all varieties of wildlife along this walk and enjoy the beginning of the fall season. www.natureupnorth.org .