I have been traveling in Ecuador and Colombia for more than 6 months now and in both countries I have been trekking and climbing at several places mostly in the National Parks and without guides.
Most of these trekkings and climbings are covered on my website with pictures and information, maps etc...
You can also find other info about the 2 countries and loads of pics. backpackingforlife.com/southamerica
[ Edit: Link made unclickable... ]