Celebrate Explorers Day
Take your grandkids on a subway car or commuter rail to the end of a line they've never reached before, hop off, grab lunch, and explore. Alternate idea: You can make an annual tradition of trying out new ways to get from here to there. Ride on a tram or monorail. Circle the city in a horse-drawn carriage or pedicab. Traverse the water in a ferry or paddleboat. Or consider jumping in go-carts, riding horses, or taking a helicopter or hot-air balloon tour.