Even if you're not headed out of town, Grand Central Station is worth a stop. Toddlers and Preschoolers will be fascinated with the huge number of trains going in and out, and this is a chance for you to enjoy a beautiful and historic building. Take a moment to visit the "Whispering Wall," right outside the Oyster Bar. Send your child to one end of the wall while you head to the other. When either of you whispers, the other will be able to hear each-other.