As Qaqortoq is a small city, it is easy to get around on foot. However, you can also rent a bike or take a taxi if you prefer. Walking will give you a closer look at the city's beauty, but a taxi would be more efficient if you need to get to your destination faster. Expect to pay around $5-10 for a short taxi ride in the city.
If you have more time, you can visit the nearby hot springs and glaciers, take a boat tour to icebergs, or hike to the scenic viewpoints. On the other hand, If you have less time, you might want to consider skipping the Nunatta Katersugaasivia Allagaateqarfialu Museum or shortening your time spent at the Qaqortoq Fjord.