CITY: London (or England)
LIKED: so much stuff.  St Paul Cathedral, Stonehenge, Eurostar.
DISLIKE: they drive on the bloody wrong side of the road!!!  I almost got killed on more than occasion (looking the wrong way to cross street)
NEAT: traffic signs and writing are quite different than US.  One said "HUMP" with an icon like a capital D on its side.  I didn't know if it was a VERB or a NOUN.

CITY: Paris
LIKED:  Eiffel Tower, Metro, Lourve
DISLIKED: People not wanting to speak English
NEAT: I was terrified to be in Paris because I don't speak a drop of french.  However, I could read the maps and pretty much went where I needed WITHOUT talking to any.

CITY: Cancun
LIKED:  Very touristy, lots of shopping, good bars, beaches, warm sun!
DISLIKED: I suppose there are seedy, dangerous places - but didn't got there.
NEAT: I was able to go/do a lot of things with my limited Spanish.