I love what I do. It's still work.
I once had a boss who would walk down the hallway and past the photocopier to my desk and ask me to make a photocopy.
There's no life lesson here. I just think about it a lot.
You don't need to come back from vacation having learned anything. It's okay to not feel refreshed or relaxed. It's okay if you didn't reflect. You don't need to be FIRED UP.