Lakeside east of Lucerne sits Switzerland's most-visited museum — because it's a climb-and-touch museum: steam locomotive cabs to enter, real Swissair planes to board, and a three-story car wall worked by a robotic lift. Rail (with the Gotthard tunnel experience), aviation simulators, Switzerland's largest planetarium, and the Lindt Chocolate Adventure ride. Five hours vanish; come early, use the combo ticket (the Pass halves it), and arrive by boat to the Lido pier. Museum till noon, lake all afternoon — the perfect Lucerne family day.