I would not travel to La Paz to see this church, but if you made it already to La Paz, it's worthwhile visiting this site and its surroundings.
Lots of history within (not properly "packaged" for tourists, which, in my opinion, is great).
Very old construction (for LatAm standards), very old and high-quality images of saints.
The "retablo" at the main church is worth looking at with some time.
Local people attend services and hang out around the church, which adds flavour to it.
Ask to access the roofs: you can get a different view of the San Francisco and surroundings from there.
Visit the back of the church: I never take guided tours unless there's risks involved in not doing so (e.g., crocodiles on the Zambezi River), but I noticed there are official guides from the church that can guide you
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