1. It is best to immerse oneself in English when learning English and not to think about one's native language or translation. 2. To encourage you and to show goodwill, here is your Chinese sentence rendered into English. "One should obey one's impulse at least twice in life: to go on an impromptu trip and to fall head over heels in love." Now you can be good and concentrate on your English in peace.

I am not quite sure if it means the same thing as what you really try to say here but here it is: One should have at least two things in their lifetimes: an unplanned trip and a committed relationship with reckless love. Hope it helps ;)