This time to and around Mariefred: And Östervik And Trosa: And watching vintage cars cruising on Friday nights:
I used to work in London in the summer, so I agree. The newer air-conditioned one-carriage tube trains are the best!
This site is full of interesting facts about all kinds of things. Nothing speaks to me like visual representations like these. They have a fascinating article on amazing maps. I have shown my favourites below. Find the rest here