On a moonless, clear night in the park, rangers’ estimate that you can see 2,500 stars just by looking up, many more than the average urbanite gets on an evening dog walk. Treat your kids to a dazzling display of heavenly lights by signing up for one of the free, monthly night skies programs. Held at Big Meadows (mile 51.3) and led by astronomers, you and your kids get to view the sky through a variety of telescopes. Depending upon the conditions and the time of year, see the moon close-up, view double stars and distant galaxies. Rangers suggest you bring a blanket and a lawn chair so you can sit comfortably. Call to find out when events are being held. Reservations are not required.