Location: 4hours drive from Tokyo in Nagano mountains/hills. Very near Myoko.
Swim: In the lake and around a shrine. A bit chilly but clean and not choppy.
Bike: A few laps of the lake which is 15k, a bit hilly but very scenic. Perfect bike course for those that like twisty hilly roads.
Run: Along side the lake with one hill.
Great location and worth doing once or twice.