Are there cabins or campgrounds around here?

Yes, punderson state park

Not in Observatory Park itself. There are other places where you can camp including Punderson State Park and Headwaters Park. They are both pretty close.

Yes, weather depending but you can.

Thank you for the response, can you still see the sky as clearly at night or go the places you can at night?

Not right there at the park, but, there is a campground called "Hidden Lakes" that is between 5-10 minutes up the road.