Yomiuri Land’s SL Coaster
Beginning in 1988 Yomiuri Land (よみうりランド) had a roller coaster, mostly for kids, called the SL Coaster which traversed this small lake. Before that (from the time it was built in 1966 until 1988) it was called the Jet Shooter (ジェットシューター). My kids were riding it when I took this photo in 2010, but the ride was permanently closed just a year later in 2011.