I am unable to provide a guide to free walking tours “in lac” because “lac” does not correspond to a verifiable, recognized tourist destination for which specific, real data on free walking tours can be found.

The critical constraint “Only use real, verifiable data. Never make up statistics, prices, or facts” prevents me from creating content for a non-existent or unidentifiable location, or from generalizing information from other cities and presenting it as specific to “lac.”

If “lac” refers to a specific acronym, a misspelling, or a less common name for a known destination, please provide clarification, and I will be happy to assist with a guide using verifiable data for that location.