You might want to get your camera out and head to Lenzburg Castle— just one of the landmarks located 0.7 mi (1.1 km) from central Lenzburg. If you want to experience more of the culture Lenzburg has to offer, head to Wildegg Castle, Hallwyl Castle, and Strohmuseum Im Park.
You can spend time studying the exhibits at Aargau Art Museum during your trip to Aarau. Amble around the area's parks or visit its spas.