I used to travel a lot with work, and most trips involved a day or two to myself, and plenty of solo-sightseeeing: New York, Krakow, Hong Kong, Shanghai, Beijing, Los Angeles, Budapest Gdansk, all sorts of places. I loved it, and as someone said upthread, you can cover more on your own, not having to negotiate/compromise with anyone else. Eating or having a beer on my tod has never worried me tbh.