The purpose of the sentence is to make memories for the college as a remembrance for future endeavours to come by.
<u>Explanation:</u>
The option for the question has not been stated, hence in general, it might be the best possible purpose to be made out of the sentence, to make <em>memories as a remembrance</em> for the college.
The future endeavours as such as college is supposed to distant the best friends as they might be going to different colleges, thereby, to <em>acknowledge this upcoming phase</em>, the one last summer adventure is chosen.
