One day trip to Nikko is enough to see the famous Shinkyo Bridge, the UNESCO World Heritage Site Toshogu Shrine as well as the Kegon Falls, Lake Chuzenji, and Kanmangafuchi Abyss. However, consider staying 2-3 days in Nikko to explore the area at a more leisurely pace, soak in an onsen, stay in a traditional ryokan with kaiseki dinner and experience some epic hikes in the Nikko National Park.