Where do I find the energy?

It sometimes amazes me how I can walk and walk and walk for hours when I'm a tourist in a foreign city - do you experience this?

We spent the day exploring most of Edinburgh Castle and after seeing the show "I Need A Doctor: The Whosical" in Pleasance Cortyard and a short break at the hotel in the afternoon, we decided to walk from the hotel all the way to the top of Arthur's Seat.
What a view! I was so happy to be up there!

We were really tired and hungry when we made it back to the center of town so a quick burger for dinner was well received ;)