This morning I went to Changchongshan to go hiking and got turned away at the entrance. Only people sweeping family graves are allowed in. Personnel showed a sign indicating that the park and others like it are closed for fire prevention season 1 Dec 2015 to 15 June 2015.
I'm posting this to let people know. I did not try to talk our way in (which probably would have been futile), and I do not know if there are particular ways or occasions to go in if you want to hike or bike.
I am also curious: is this specific to Changchongshan, or does it apply to other areas like Xishan? (I noticed a previous thread indicating that Changchongshan had a fire several years back.) Is there anywhere one can one go to get out of the concrete jungle without leaving town?