In 2010 I was backpacking in Colombia. Zipaquira was my first day trip from Bogota. What makes Zipaquira so interesting is underground cathedral in former salt mine.
Enjoy the pics:)
If you are interested to find out more here is a post about Trips around Bogota.
Another good post is about Colombia itinerary i used on visit to Colombia. The beauty of this itinerary is that it can help you with planning your trip to Colombia. It could be easily modified from original four weeks to two weeks: Backpacking Colombia