When visiting a new city alone your only friend is a map. Though a map is not great at conversation. I learnt this the embarrassing way. There are plenty of sights to see in Copenhagen in winter, which could be comfortably seen in 3 or 4 days.
But I learnt that when you have no one to bounce ideas off, or tell you when breaks are needed, you will just seem to walk all day, see everything at double speed, then be absolutely rooted by 6pm.
I ended up in Copenhagen because I had just began my semester abroad in Leeds and planned to see as much of Europe as possible in the process. After getting settled I distinctly remember saying to my housemate who had come over from Australia within the first few days: “So, where do you want to go this weekend?”