The Wall Street Mill offers incredible views of Joshua Tree. If you choose to hike it at night, you'll get amazingly dark skies, great for capturing the Milky Way.
Hike along the easy Wall Street Mill Trail for about one mile and you will reach the mill - if you are into night photography, this is an amazing subject that will bring you back again and again, always capturing something different. Explore around off trail - there are tons of boulders to play and climb around on - keep track of where you are if hiking at night though!
Camping is by donation, pick up yellow/manila envelope at entrance of each campsite. Choose campsite location, fill-out envelope, tear perforated portion, and clip on campsite post number.