No one has mentioned the American Adventure. I've enjoyed all the movies in WS (several times), so here's my assessment of them (with a view of pre-adolescents).
Canada: If this is the first one you visit, just the experience of being in a 360 theater will catch their attention. Yes, the current movie is dated (and boy do I cringe at wearing clothes JUST like those back in the early 80s!), but you'll get a good appreciation of just how diverse Canada is. They will show you the seacoasts of the Atlantic Northeast, the city lights of Quebec province, the governmental buildings in Ontario, and the roundups in the west. You'll also see the Royal Canadian Mounted Police (Mounties), which is a pretty neat circlevision experience. As I recall, this movie's only about 20 minutes. Frankly at that age, your kids should be able to experience this without any difficulty.
France: Somehow I had missed this movie until the last year or so. I honestly didn't know there was a theater in there! This is a sit down movie. The CM who introduces the film can sometimes be very hard to understand. I always find it fascinating when the CM doesn't "look" French, but they speak with that thick French accent. But I digress. The movie has some absolutely breathtaking scenery. The soundtrack is very classical. I recognized quite a bit of the music from Beauty and the Beast. The narrator is very easy to understand, and he talks about the parts of France that most people aren't aware of. You'll see a village market, a seaside fishing village, and small town wedding, and the mountainsides. You'll also see some gorgeous footage of Versailles, and Paris. It's a little longer (at least 30 minutes), but you are sitting down.
America: This is another sit-down theater. Arrive 30 minutes early (and before 5 pm), and you'll be treated to the Voices of Liberty. They are a SPECTACULAR acapello singing group that does traditional American folk songs! The AA attraction is more than a film. They intermingle some animatronic figures (Mark Twain, Will Rogers, etc.) This is probably the longest movie in WS (at least 30 minutes, if not 40). It's a view of the history of America (with a fair bit of whitewashing... hardly anything on the civil rights movement or Vietnam; but they did do a good focus on the depression, and the Civil War). They start with the Mayflower and the American Revolution. My 15 year old DD particularly loves this attraction. She's probably seen it at least 10 times. They intermingle still pictures (from the Civil War and earlier paintings) with music and animatronics. They add more historical videos in the post-Civil War timeperiod. There are two songs on that film track that I really like. "One wore Blue and One wore Gray" is the soundtrack to the Civil War sequence. And at the end, they play the theme song "America, spread your golden wings." Both of them make me cry.
Norway: This film is in a room at the exit of Maelstrom. Many people walk through, skipping the film (including me most times). There are rows of straight chairs (not theater seats) in there. The video is only about 10 minutes, and it's geared more as a tourism spot. Quick glimpses of the scenery in Norway, and the lifestyle. Frankly, it's only 10 minutes. It would probably be good exposure to other cultures if you've never done it.
China: This is another 360 theater. This film is "narrated" by someone portraying an ancient Chinese poet (can't remember his name). It starts on the Great Wall of China, and moves throughout the country. I highly recommend this film (also about 20 minutes long). I never knew how varied the scenery in China was! You'll see mountains, crowded cities (Hong Kong/Shaghai), deserts, rice patties, and endless plains. Well worth the time.
So I guess my recommendations for your kids are:
China
America
Canada (especially if it's a new film)
Norway
France
Hope this helps!