Bolivian tourism has really taken off in recent years, but the industry and its associated infrastructure is still in its formative stages.
Flash new InfoTur (www.visitbolivia.org) offices, working in agreement with local government, have opened in most of the major tourist destinations. However the amount of printed material available and the level of attention from staff can vary from place to place, and from visit to visit. Don't expect a lengthy conversation if you go just before lunch for example!
At the national level tourism comes under the auspices of the Ministerio de Culturas y Turismo (Ministry of Culture and Tourism) which concentrates more on statistics and bureaucratic spending than on promotion of the country’s attractions or imposing safety regulations.
There are often tourist information offices covering the prefectura (department) and alcaldía (local municipality) of a particular city, but these are under local government control and often bereft of material. Typically you will need to speak Spanish to make much use of them, though they can be very informative.
Note that the posted opening hours are not always followed.
There are no tourist offices abroad.
There is plenty of competition between tourist operators in the most popular destinations and this is often reflected in their website content, driving the urge to provide more information to make the company more attractive. This can be a useful research tool, provided you remember the context the information is provided in!