Many visitors seem to forget (despite breathing problems) or ignore the fact that La Paz lies at 3600 m.a.s.l. (ok, between 3200 and 3800 m.a.s.l., depending on the neighborhood). With other words, you´re 3000 meters nearer to the sun than (probably) 90% of world’s population.  Locals living in La Paz learn their lesson sooner or read more »