東京ミッドタウン日比谷 パークビューガーデン MIDTOWN HIBIYA PARK VIEW GARDEN
It is a little hard to find, but it is a very pleasant place overlooking Hibiya Park and the Imperial Palace. To get there, go to the movie theater from the 3rd floor and take the escalator to the 6th floor. There is a cafe on the same floor, so you can buy a drink and relax here.