Sheryl, >I would like opinions and some 'sites to see' information from anyone who >feels like sharing.
If you're going down the west coast, I would highly recommend Copper Canyon (Barranca del Cobre). A bit to the north is the spectacular waterfall Cascada de Basaseachic, over 800 feet tall. Both of these are nominally parks, but when I was there you could basically do whatever you wanted, within reason of course. These are fairly high alpine environments, so be ready for snow and cold weather in December. Mark Minton