If you want to get a cool natural scenery and shady trees, Pine Forest in Imogiri Jogjakarta is best location . Here presents the experience of visiting the artificial forest and located in the cool temperate highlands. The location itself is in Mangunan, Dlingo sub-district, Bantul regency, Yogyakarta Special Region, so it not so far from the city of Yogyakarta. At this location you can find some tree houses / observation post and you can climb upward . Above the tree house you can see the green hills stretching.
Source : http://alindstransport.com/wisata-sejuk-di-hutan-pinus/