It’s common to find restaurant employees or owners near the front door of their venue, readily handing you menus and pulling you into the restaurant to sit down. Some even walk alongside you down the street. Politely decline and be on your way.
Canals run aplenty throughout Europe; not all are clearly marked or identified. Many small towns and villages have channels that flow right up to the street, and when the water is high or covered in grass, tourists have fallen in accidentally.
Similar to costumed street acts you’d see in Hollywood, there are areas throughout Europe with locals dressed in costumes. The gimmick is that they offer to take photos with you and then demand you pay for the pictures.
Renting a car applies to travelers heading to major cities. If you plan to stick to the city, there is little need for a rental car since many cities are walkable with easy access to various shops, dining, and entertainment.