Oh forbidden forest is at least close to Hogwarts and I can get out of it if I keep my mind....but Azkaban on the other hand........

I think Azkaban because it’s only a day but... in there, their are the most dangerous wizards/Witches!

Azkaban

Forest, because most people go insane in Azkaban quickly.

Spend a day in Azkaban- but after the Dementors were removed