the Hop on Hop Off L'Open tour was the best thing because it connects you to east , west , north , and south of paris . All the historic places you can enjoy simple from the roof top of the bus .But would give one suggestion , please try to avoid the late june and july early season , as its unbearably hot on those few days. We found temperature almost 45 degrees. One more suggestion , please buy tickets in advance so that u save some money as well as time and long queue.