Oslo May 13; hotel, things to do

I'm going to be in Oslo for one afternoon. From about 1pm, flying out the next morning. I'm debating getting a hotel near the airport or downtown. Im also debating the options on things to do. We did fjords in Bergen and Naeroyfjord. But I love a boat. There's many options for art so I might do something like that. I also love food but have celiac disease. And kind of fun class that afternoon would be cool too. Thanks friends!