a trip taken to celebrate or shortly after graduation, often with classmates or friends
来年、友達と北海道へ卒業旅行に行く予定です。
Next year I'm planning to go on a graduation trip to Hokkaido with friends.
大学の卒業旅行ではクラス全員で海外に行った。
For our university graduation trip, the whole class went abroad.
卒業旅行の写真をアルバムにまとめた。
I put the photos from the graduation trip together in an album.