Being 'single' now for about twenty five years, I have a great deal of practice of doing most things by myself.
As others have said, the only thing I find on my own a little pointless is having a meal in a restaurant. When I am in a hotel I always take my kindle to the dining room, to use whilst I am eating.
There are so many times I really prefer being by myself. I used to go every year to the Ideal Home Exhibition, and on a couple of occasions gave in, when friends asked to accompany me. Hated it!! Loved doing this sort of thing by myself, with no=one else to consider when or where I went, how long I stayed, etc. etc. Eventually, I never told anyone I was going until afterwards.
Love having a coffee and cake somewhere when out and just happily, people watching.
I enjoy coach holidays, etc. When I was still working, I went on a much planned few days to Cornwall - three nights in a hotel and trips to Eden Project, etc. Looking forward to all of that and not having to chat to anyone. Sadly, another lady on this trip as a single attached herself to me totally. I could not be rude and she would not take any hints that I preferred to be by myself.. Completely spoiled my first time to Eden Project for me.
Indeed the final day, I hid in my room after breakfast until the coach had left on its outing that day - and then went off by myself to a local jewellery making factory. That evening, when asked, I lied and said I had fallen asleep and missed the coach!!!!
I do enjoy company. Love meeting new and old people in many circumstances. But also enjoy many experiences on my own.