I had a day to spare in Santiago a couple of years ago. I hired a taxi for the day (this was recommended in an article I read in NARGS' Riock Garden Quarterly) and went up to one of the ski resort areas closest to the city. Didn't cost more than £50-60 for about an 8 hour trip, no stress from driving in the city and the flowers were out of this world. And, yes, the Hoffmann book is essential....
Stephen, Malvik, Norway