Walled town, then beaches
Tap water excellent in Athens; on many islands locals drink bottled
Round up or 5–10% for good service — appreciated, never required
Motorway tolls are booth-based and take cards. On islands, hire cars/scooters/quads are everywhere — photograph the vehicle thoroughly before driving off, and note quads legally require a car licence.
sourced — translations from published sources; corrections come from user reports
Free to start. iPhone first — Android close behind.