Hi-we will be in Copenhagen at the end of May with our three kids ages 13, 10, and 7. We're wondering if there will be plenty to do to keep everyone occupied (we like museums, art, culture, and outdoor adventure, and the kids like amusement parks, exploring, and anything "cool" or "exciting" (-: ) or if we will regret not taking a few days to either go up to Stockholm (our daughters have read/watched all the Pippi Longstocking in preparation for our trip but not sure going all the way up and back to Stockholm is worth the effort for the Astrid Lindgren park) or over to Oslo for a day or two Norway in a Nutshell type trip through the fjords. Anyone have any insight on whether we should limit ourselves to Copenhagen and surrounding areas reachable by train day trips (we weren't going to rent a car, but let me know if we should!) or if we have time for a few days somewhere else--and whether it should be Stockholm or Oslo/fjords/Bergen? Thanks so much in advance!