Greece is one of the safest countries to travel and you're more likely to suffer from heat exhaustion than from any kind of crime!
Halkidiki is normally a safe, friendly and hospitable region and crime rates are very low here in comparison to other parts of southern Europe. More specifically, public transportation, travelling alone and visiting most places in Halkidiki is secure. Also, the risks of falling victim of a terrorist attack or a natural disaster are very low. Still, like anywhere in the world, it pays to follow a few simple precautions to minimize your change of getting ripped off.
As with other EU states, the emergency telephone number in Greece is 112.
Tourist Police: 1571
The tourist police have opened up an office in "Macedonia" International Airport and are on duty at the kiosks to help visitors arriving in Greece with any questions they have relating to local laws or other tourist-related issues.
Note that most officers at the airports speak foreign languages.
Hotels, restaurants, travel agencies, tourist shops, tourist guides, waiters, taxi drivers and bus drivers all come under the jurisdiction of the tourist police. If you have a complaint about any of these, report it to the tourist police. If you need to report a theft or loss of passport, go to the police station.