My wife and I did this tour today and it was great. The guides (both who spoke excellent English and Spanish) were very knowledgable about not only the history and the stuff you would expect to learn about, but also some of the stuff you want to find out but can´t in guide books (recommendations, tricks of the trade, local culture and so on). Completely free trip (altough you can tip at the end) and lasts about 2.5 hours and you normally meet a load of other interesting people-travellers.
Was actually my first walking tour of any city and really enjoyed it. Thoroughly recommend it to anyone who wants to get a good grounding of La Paz and to learn more about some of the interesting buildings, historic events and places to see.
If you own or manage Red Cap Walking Tours, register now for free tools to enhance your listing, attract new reviews, and respond to reviewers.