Other than leaving my cats, I don't like the sheer exhaustion when I come back home. It's not even from jet lag. I'm a person who cannot go someplace I have never been and just "relax" and do nothing. I want to explore and see EVERYTHING. When I went to San Francisco in 2017, I walked 45 miles in the 5 days I was there. It's a good trip when I come back exhausted, but I wish I had more time to recover at home before I have to go back to work, so that's really the thing I hate: not having recovery time.