Reykjavík is compact and easy to explore on foot, so base yourself in the city center to walk to Hallgrímskirkja, Harpa and the Old Harbour. It is also a great place to base yourself if you only have a couple days and want to join day tours. Get the Strætó app for bus tickets, avoid taxis unless necessary, and only rent a car if you plan to drive outside town. Daylight varies wildly by season so plan activities accordingly, keep an eye on aurora forecasts in winter. There are a lot of cute cafes, shops, restaurants and the iconic church to check out too.