This lake is a caldera lake that belonged in the Shikotsu Toya National
Park and was enclosed by mountains. Some of the mountains, like Mt.Tarumae,
Mt.Eniwa, have a lava dome.
Lake Shikotsu is an ice-free lake which is located in the northernmost of Japan.
Hot Springs in Lake Shikotsu
There are some hot-springs facilities including accommodation which accept
one-day use on the bank of the lake.
Mt.Eniwa
This mountain is an active volcano. The slope of Mt.Eniwa was used for Sapporo Olympic.
Mt.Tarumae
This mountain is also an active volcano. And it is a threefold composite volcano.
Sightseeing Bus for Day Trip from Sapporo
There are many courses of sightseeing bus for day trip. You don't need
to care about transportation, the bus directly brings you to sightseeing
spots! Some of courses include meal.
You can see the detail in English on the web page of Chuo Bus.