National Geographic Traveler has just posted its top 20 best things to do in cities around the world this summer. Here are mine, in reverse order:

20. Stockholm, Sweden Have a tour of the recent riots, taking in some great ethnic food along the way. Take the blue (T11) metro line to the northern suburb of Husby. Then top it off with a spot of nude sunbathing at Ågesta Beach (bus 742).

19. New York, United States Take a trip back in time on the famous New York subway, unchanged in 40 years. Has the US completely lost it? It’s 1973 down there. Lou Reed’s chewing gum, spat out as he left the Velvet Undrground’s session for Loaded in 1969, still visible at Spring St. station, SoHo.

18. Singapore, Singapore Play hide and seek with your kids in the smog (but do wear masks). Plenty of time left to do it:…