2026 Tokyo Summerland Adventure Lagoon (東京サマーランド アドベンチャーラグーン) (Outdoor Pool) One-Day Adventure Course

This one-day course centers on “Adventure Lagoon” (アドベンチャーラグーン) at Tokyo Summerland (東京サマーランド) in Akiruno City, open from Saturday, July 4 through Sunday, September 27, 2026. In the morning, enjoy the murmuring clear stream and greenery around Ishifune Bridge (石舟橋) in the Akigawa Valley (秋川渓谷), then head to Akirudai Park (秋留台公園) for some play on the spacious lawn and playground equipment. After conserving your energy while enjoying the coolness, it's finally time to enter the outdoor pool at noon. Float along on the roughly 650m-long lazy river “Great Journey” (グレートジャーニー), or take on several water slides — the water play doesn't run out until evening. Changing rooms are fully equipped, so there's no need to worry about getting changed. Easily accessible from central Tokyo, this classic outing lets you enjoy nature and water play all in one day, making it perfect for summer vacation.