The lake is dotted with numerous small islands, adding to its charm and providing excellent opportunities for exploration and outdoor activities. Visitors can enjoy leisurely boat rides, either by renting rowboats or taking guided tours, to appreciate the serene landscapes and spot the diverse bird species that inhabit the area. The park offers well-maintained walking and hiking trails that allow visitors to experience the natural beauty up close, with trails leading to panoramic viewpoints and scenic spots around the lake.
Onuma Lake is also known for its seasonal beauty, with vibrant autumn foliage, snow-capped winter scenes, and the lush greens of spring and summer offering a different perspective throughout the year. Its peaceful setting, coupled with its accessibility and recreational opportunities, makes Onuma Lake a popular destination for nature lovers and outdoor enthusiasts.