Riegrovy Sady is a park on a hill that overlooks the city. It also has a beer garden, which was quite spacious and had lots of vendors selling food and drinks. Although the Czech Republic is famous for its beer (particularly Pilsner Urquell), I'm not much of a beer drinker, so I enjoyed a cider on one of the benches before sitting on the hill to watch the sunset. I stopped by a few times throughout the semester, and the park was always crowded with fellow sunset watchers.
Do we learn more about Langdon? Not much. He is still so world-renowned that, as doesn't happen for most academics, fancy hotels monogram his slippers for him. His password for most things is Dolphin123, because he's good at swimming. He is too old-fashioned to like texting or videogames, and just a little prudish. He has never seen When Harry Met Sally, but has heard about the famous sex scene'.