We arrive in Zurich the morning of 1 July and would like to visit Lucerne and Lauterbrunnen before flying to Prague on 3 July. We have a party of five. Would it be easiest to rent a car, or take the train? It appears to be two hours by train from Zurich airport to Interlaken, from which point we'd have to take a bus (I believe) to Lauterbrunnen of Grindelwald. Is the drive rather easy? It would obviously give us more flexibility. Thank you.