✔ 最佳答案
阿寒湖 is the best !
The scene around阿寒湖 is very very pretty. All hotels – expensive or inexpensive are close to the lake. Also most hot springs are open door, and open until midnight. So you can enjoy the sky at night while having your hot spring.
There is also a short yet unique small road in 阿寒湖, you can buy many Hakkaido souvenirs here, including the local people – Aru people’s handicraft.
In my opinion 支笏湖 and 洞爺湖 are not as pretty as阿寒湖, though they are also famous for hot springs.