Greetings When greeting females or mixed company, an air kiss on both cheeks is common courtesy. Men give each other a handshake.
Visiting churches It is considered disrespectful to visit churches as a tourist during Mass. Taking photos at such a time is definitely inappropriate.
'Free' appetisers Whatever you eat, you must pay for, whether or not you ordered it. It's common practice for restaurants to bring bread, olives, cheese and other goodies to the table, but these are never free and will be added to your bill at the end. If you don't want them, a polite 'No, thank you' will see them returned to the kitchen.