There's no 에 so I don't see how you get 'to'.
"校長 先生님은 修學旅行을 가요." "The principle goes on a school excursion." Well at least over here they often go to do fun things and not just to study. Field trip sound more to me like (사회) 견학 = (社會) 見學. Maybe for 소풍 = 逍風/消風 I'd just say outing. I wonder how these are really used . . .