I went to Lake Yamanaka in Yamanashi Prefecture, at the foot of Mt. Fuji. I enjoyed working five days and four nights using the SANU 2nd Home subscription villa. I was working most of the day, but in between, I could enjoy things like taking a pleasure boat on Lake Yamanaka and riding an amphibious bus.
Lake Yamanaka is easy to come from Shinjuku Bus Terminal, so I would like to visit again.