I will try to answer most of your questions. I've not been on the "Norway" for more than a year, so I'm not sure about some of them. For some excellent pieces of information about taking a cruise onboard the "Norway", make sure to have a look at this web page
1. The "Norway" offers a traditional cruise experience in contrast to the Freestykle Cruising concept offered on the other NCL ships. The main difference is that there are assigned two sittings for dinner.
2. The itinerary includes Great Stirrup Cay. However, as the "Norway" tenders in all ports of call, she sometimes misses GSC or one of the other islands in inclement weather conditions.
3. The Club Internationale is open to everybody. Just feel free to walk in. Sadly, some passengers tend to abuse this wonderful room (the most beautiful lounge afloat IMHO) as an indoor cafeteria. This is a grand room, which today is much more beautiful than in the days of the S/S "France".
4. There are lots of post-dinner activities, including production shows in the Saga Theatre, comedians, magicians etc. in the North Cape Lounge, Ballroom Music in the Club Internationale and so on. Of course there's also a casino, and the ship's disco, Dazzles, is located on Viking Deck, aft. On some nights there are pool parties, and both the Sports Bar and the Windjammer Bar offer different kinds of music.
5. The Chocoholic Buffet is a midnight buffet. On my most recent cruise onboard the "Norway" (August, 2001), the Chocoholic Buffet was on the third night.
6. please see 4.
Hope this helps, and have a wonderful cruise onboard the "Norway". She's a wonderful ship if you know what she is and what she's not.