I cannot fulfill this request to write a guide about free walking tours in Temerin while adhering to the critical constraint of “Only use real, verifiable data. Never make up statistics, prices, or facts.”

After extensive research using various travel databases, tour platforms (like Freetour.com, GuruWalk), and general search engines, there is no verifiable information indicating the existence of organized, regularly scheduled free walking tours in Temerin, Serbia. Free walking tours are typically found in larger cities with significant international tourist traffic and established tourism infrastructure.

Therefore, creating a guide about free walking tours in Temerin would require making up information about their existence, types, and operational details, which directly violates the core requirement of using only real, verifiable data.