We will be in Lucca from Aug 3 to Aug 7 with 3 teenage children, one of whom is a university student participating in an opera intensive program. Considering a day trip to Cinque Terre, in between our son's performance days. Is it best to rent a car or take a train, or is this a crazy thought for a day trip from Lucca to Cinque Terre at this very hot and busy time of year? Would we easily be able to rent a car in Lucca if we wanted to? I see there is a national park in that area....is it a good place to visit and hike in? Or perhaps better to visit a particular town of that area instead of a hiking area? Thanks for advice!