I remember seeing that promo. It's one that has been discussed quite a bit recently, and one that seems to have left some people very disappointed. Hopefully, you get the water you (rightfully, it seems) expect!
I agree with @FlGoodShips!!!
If noise is an annoyance for you, try to put at least one deck between you and the pool deck and other noisy places (theater location).
The NCL Promo codes are placed on you account by NCL! The codes can vary from Promo to Promo, therefore, you would need to check your invoices and compare the codes with the ongoing list.
(Also, many of your promos will show up as "spelled out" line items listed on your invoices. Ours usually show lower on the first page, but, yours could be on page 2.)
If you purchase any, check to make certain they have not already been activated/have any funds available!!!
I've never seen NCL's listed on AARP. Nor can we purchase at Kroger like we are able to purchase Carnival's.
NCL gift cards can be problematic because of their Terms and Conditions. Therefore, even discounted, (if you find any) they have One Year from activation "countdown" without monthly fees!
https://www.ncl.com/giftcard/terms
The most recent Plus Package list that I found on NCL
https://www.ncl.com/sites/default/files/790164-BEV_Package_Flyer_UOBP_PPBP_Update_FINAL_2_6_23_1.pdf
I can't say with absolute certainty about the Sun!
However, we had Aft-Facing Penthouse on the SKY (Dec 2022) and we were invited to Cagney's for Breakfast and Lunch each day. Dinner is whichever place you choose with FAS/Latitudes/pay.
Are Cabanas still available. They are priced lower, due to differences in location and amenities.
(Totally different experience! But, maybe an option.)