15. There are regular outdoor markets for more than just food, clothes, toiletries & souvenirs
There's a used-book market in the Spui every Friday (and an art market there on Sundays), but there's an even more charming almost-daily book market (plus prints and sheet music) in the covered arcade of the once-upon-a-few-centuries-ago home for the elderly called the Oudemanhuispoort. On Mondays, the Westerstraat turns into the Lapjesmarkt for fabric (and, okay, some clothes). Most niche of all, though, is a small section of the Nieuwezijds Voorburgwal that turns into the Postzegelmarkt, a stamp and coin market, every Wednesday and Saturday.
16. There's a rope swing between the wooden walkways snaking through the dry-docked boats of de Ceuvel office terrain
Because the ground is lava. Okay, not really, but the ground has been contaminated by years of processing heavy metals. Feel free to wander over from the cafe and take yourself for a swing.