If you're going to be outside for any length of time, the worst thing you can do is stand and continuously crane your neck upwards. By the next morning, there's a fair chance you'll have a stiff neck or achy shoulders.

"I've found that an adjustable observing chair (such as a long lounge chair) can add hours of pain-free enjoyment," says Mike McCormick of Deer Park, New York.

At the very least, bring along a small folding chair. If you plan to pack equipment (such as binoculars, telescopes, sky charts) consider also a small folding card table.

If the weather is warm, bugs and mosquitoes are likely to be out, so you'll need insect repellant. Lastly, you might like to bring some music to listen to while you're out under the stars. "I always like to bring some instrumental music to help enhance the atmosphere," says Charlie Rullmann of Islip Terrace, NY.