Further North: Chiang Mai
     Our next stop was Chiang Mai, the largest city in northern Thailand.  I've heard it called the second largest city in the country on several occasions, but after a little reference check that's actually wrong - big surprise that a random word of mouth fact is incorrect ( http://en.wikipedia.org/wiki/Template:Largest_cities_of_Thailand ).  It's hard though to say exactly how big a city is; do you use just the city limits or the metro area?  And what constitutes a metro?   This topic is probably boring or too technical for many, so I'll try not to drag it out.  It's caught my attention because I like statistics and I've seen widely different numbers for a city's population.  For example: in my guide book the population of Bangkok is 7 million. On Wikipedia the population of the city proper is 8.3 million, the metro over 14.6!  Anyway, back to Chiang Mai: the metro area has close to a million people.     The old city is surrounded by a moat, but there are...