If you're planning a bit of sightseeing head to Nordmarka— just one of the monuments in Gamle Oslo. You can also discover the museums and cathedral in the area— your sightseeing tour starts here.
You can spend an afternoon browsing the exhibits at Glasslåven Kunstsenter during your travels in Gran. Amble around the area's parks or experience its museums.
If you like art, you might want to browse the collections at Hadeland Glassworks in the heart of Jevnaker. If you want to experience more of the culture Jevnaker has to offer, head to Kistefos-Museet and Ringkollen Alpin.