回复：我父母下月要来美国,想请他们到欧洲去玩一趟,查了几个旅行社的

Don't join the tour group if they understand the English. In Paris, it's very convenience to take subway to get around. But if they want to see different palce and different country, join the tour group is a good idea. You may let them to have cruise there to see different place.