While looking for a book, I stumbled across the website of the store of Concordia Language Village. This is a camp in Minnesota which does week long culture experiences in 15 languages, including Norwegain. They have an architecturally authentic Norwegian village they call Skogfjorden and offer youth and adult programs, 1-2 weeks. Language, food, music, songs, sports, crafts, dance, canoeing on the 'fjord', speaking Norwegian all day, it sounds awesome.
If we had the time this summer, we'd send the kids!