第一句：I prefer a package tour.
我喜欢组团旅游。

A: Do you like a package tour to travel alone?
你喜欢组团旅游还是独自旅游？
B: I prefer a package tour, and we don't have to worry about accommodation, meals and sort of trivial things. And you?
我喜欢组团旅游，不用操心住宿、吃饭等那样的小事。你呢？
A: I‘d rather travel alone, for I can have more time to visit those that attract my attention.
我宁愿独自旅行，这样我会有更多的时间去参观那些吸引我注意的事物。

第二句：I’m going on a guided tour.
我要跟导游团旅行。

A: I‘m going on a guided tour in the mountain.
我要跟导游团在山里观光。
B: You'll see the world-famous magnificent waterfall.
你会看到世界著名的壮观的大瀑布。

组团旅游是：package tour，相对应的就是自助旅游：budget travelling或者叫self-help tour，导游用英语说是tour guide，导游团则是guided tour。