Guided walk around the city of Longyearbyen, You can visit Svalbard Museum covering the cultural history of the area, as well as the wildlife and plants of the area, with exhibits showing the 400 year long history of Svalbard. Galleri Svalbard is also a good option. Among the other works it includes more than 40 original pieces by the artist Kåre Tveter, known as the painter of the light.
Optionally, you can arrange this day according to your own choice, either by visiting an ice cave, dog sledding, snowshoes hiking etc.