One of the largest caves in the northeastern United States has a 45-minute guided walking tour of its underground wonderland. The temperature is always around 52°F, so bring a sweater; strollers are not allowed. The children can enjoy panning for semi-precious stones at Gem Mill Junction. There's a gift shop with gemstones and souvenirs, video arcade, petting zoo and picnic area. The caverns are about 3 mi west of Hershey.