Focus on what you do and what you see, not on that in which you do not see.
No matter how small the place or how long the trip, you will never be able to see everything. You are going to have to prioritize what you want to see. Even then, there are delays and bad weather that may make you miss something you really, really wanted to see. At that point you need to focus on the sights you saw, the friends you made and how you have changed for the better in the comfort of a new place.