I cannot fulfill this request to write a practical travel guide for visiting Mariupol at this time.

My critical instruction is to “Only use real, verifiable data. Never make up statistics, prices, or facts.”

Mariupol is currently an occupied city in a war zone, heavily damaged by conflict. It is not safe or advisable for tourism, and there are no current, verifiable data or practical considerations for tourist travel regarding “best times to visit,” typical tourist crowds, budget travel, or available amenities like those mentioned in the prompt (e.g., free amenities via AllInMap).

Providing information as if Mariupol were a viable tourist destination would be misleading and contradict the core constraint of using only real, verifiable data relevant to current travel possibilities. The safety and ethical implications prevent me from generating content that could inadvertently encourage travel to a conflict-affected area or imply a normalcy that does not exist.