Yes, the dark sky area is open all night. The park is open from 8:00 am to 10:00 pm.
Yes, it is possible to come just for stargazing. I did that myself. Dark sky area is by the beach. I just wish the car parking was slightly farther or away from the eye sight, like the one in Port Austin. Headlight beams can be annoying sometimes, but definitely won't hinder the star/comet gazing. Make sure that the clouds are clear though! :)
Yes. Assuming that the storms and cloud cover is gone.
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