In Greece, and thus Halkidiki, wearing heels in sites of archeological magnitude is forbidden. This law aims at protecting the ancient treasures from abrasion and wear and tear. Namely, on the occasion that you plan to visit Ancient Stagira, Ancient Olynthos or the ancient town of Toroni, be aware and be mindful!
The Greeks and indecent behavior don’t mix. If you’re the type of person who gets a laugh out of mooning other folks, you might want to keep your pants up and your belt buckled. Dropping your drawers is a chargeable offense in Greece that can bring with it a steep fine or jail time.
Athenians are very proud of their metro. This recent innovation (which posed many troubles during construction), is definitely superb compared to many other capitals, and that’s because Athenians have learned to respect it. If there is one place Greeks follow the rules, it is in the metro. As such, they will never eat or drink in it (though water is allowed, of course), and they expect tourists to do the same.
Don’t rely solely on credit cards. Credits are convenient, for sure, but Greece loves cash. While there may have no problems paying by card at hotels and big restaurants, this may not be the case in more remote areas, or less touristy islands, or in more traditional tavernas, so always make sure to have enough cash on hand. Otherwise, make a trip to the nearest ATM.
Showing too much skin in a church. With a number of stunning churches and monasteries, tourists are bound to enter a church. Be aware of the dress code: long shorts or trousers for men, long skirts for women, and no swimming suits. In some instances, women will be given a wrap. Religious or not, try to stick to this rule as much as possible.