I'm not sure if this exists for everyone, but, on our Confirmations, listed below TOTAL PAYMENTS APPLIED (and before Cancelation Fee Schedule and *** IMPORTANT INFORMATION ***) there is a list of our included perks, which are spelled-out (not just codes). They are under a heading bar "Add-ons".
We have enjoyed cruises on each of those three ships.
Of the three, the Sun was our least favorite because of a few different lay-out issues. (Things such as Dexddd stated above!) While the Sun is oldest, yet, I don't believe that is one of the factors.
None-the-less, IF the itinerary is WOW, we'd base our decision solely on that factor!!!
NCL has changed the rules for use of vouchers. For cost cutting measures, NCL has decided to make some limitations. You, as a Solo traveler, have access to 2 Latitudes specialty dining meals during a cruise of 5 days or longer. Anyone with whom you choose to dine, is on their own for "how" their meal will be paid! The one area of restriction that NCL has removed is "where" the vouchers may be used!
The link below might give you a better "feel" for GSC (Plus some other things with NCL) - -
https://view.ceros.com/ncl/latitudesmagazinefall2022/p/2?cheetahid=5000005580678&mi_u=5000005580678&cid=EM_MKL_LTM_PGU_EML_cta_EML_LATMAG_LATNEWS091722
Originally (years ago), the plans were to have Haven accommodations on GSC.
However, over the years, NCL has turned towards more "revenue generating" plans. Which means that those seeking a HAVEN-like experience at GSC, will need to book and pay for a VILLA in Silver Cove.
A few reviews of Silver Cove have been posted. Generally, you can find them in:
https://boards.cruisecritic.com/forum/308-private-islands/
Maybe this will help you a little: (NOTE: It is almost two years old!)
https://www.cruzely.com/ultimate-guide-to-harvest-caye-belize-norwegians-private-island-tips-map-and-things-to-do/
They will certain expect you to go to your Muster Station to "Check In"! Once you have done that (only a few minutes of your time) you are free to go about your day. However, it is still possible that you'll have to watch the video (yet again) once you are in your room.
Based upon many posts (this year) regarding "upgrades," you might need to upgrade to a room category that costs more than you paid for your current room.
Calling, or using chat, might get you an upgrade at no additional change. But, NCL has no obligation to do so.
Best to ask Port related question in the PORTS forums. Here is a link to Aruba (Lots of info there!!!):
https://boards.cruisecritic.com/forum/101-aruba/
Haven guests need reservations for the Specialty Restaurants (like any other guests)!.
However, you may book reservations at 130 days, vs 125 or 120 for everyone else!