Photo: Brunost16, CC BY-SA 4.0 via Wikimedia Commons
You have not really seen Bodø without a visit to Keiservarden. From the summit, you have a wonderful view towards Bodø, towards the surrounding islands and, if the weather is good enough, towards the Lofoten. There are several paths, all relatively easy. Count 1h hiking (one way) from the bottom, plus an additional 30 minutes (one way) from the city centre.
Keiservarden is a mountain plateau on top of Veten hill near Bodø, Nordland in northern Norway. It lies 366 meters above sea level and is named after German Emperor Wilhelm II, who supposedly climbed the mountain on one of his many visits to Norway on 19 July 1899. It is disputed though whether Wilhelm II really visited the place. The second half of the designation, varden is a Norwegian word for a pile of stones that indicate a mountaintop as well as the way up there.
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Bodin Church
One of the oldest churches in Norway, built around 1240.
Norsk Luftfartsmuseum
Located in the shopping centre area, a 20-minute walk from the city centre or the airport, you can visit a quite large museum and experience the history of aviation and highlights from the Cold War. Bodø is one of the airfields used for U-2 high-altitude recon and ozone monitoring.
Bodø domkirke
Modern with a separate bell-tower and a beautiful window.
Bodø open air museum
Various traditional house styles from Bodø.
Strong tide current in Saltstraumen. The world's strongest maelstrom (tidal whirlpool), with some of the best fishing in the world. International fishing competitions are often held there, and there are possibilities of renting fishing gear or staying at the camping place. A must-see if you are in the region.
The largest natural cave in Scandinavia (30 m from floor to ceiling) and the only cave with a glacier inside. The ordinary tour visits the big cave rooms, while more adventurous routes can be requested. A full day, partly strenuous hike. Guide is highly recommended, otherwise experience is required. No walking outside existing footprints in the cave.