BACKGROUND: My live in girlfriend and I(late 20s no kids) are arriving in early Febuary for 4 nights at Port Orleans French Quarter followed immediately by a 4 day cruise to the Bahamas(Carnival).
At the moment it seems like we will have an evening open upon arrival and 3 days for the parks. We are considering individual park tickets as opposed to park hoppers.
I just wanted to get the boards oppinions on
*the above mentioned base plans
*pairing a cruise with a WDW. vacation
*tips for first time cruisers
*experiences and ideas for a more adult and ,dare I say it , romantic visit to WDW.
Sounds similar to DH and I's honeymoon...spent the first 3 days at WDW, then took a Carnival cruise to the Caribbean

It worked out very well for us. The WDW part of the vacation was a bit go-go-go (just b/c we had 3 days and 4 parks to see! Neither of us had ever seen AK before, or been to WDW in at least 10 years at that point). But it worked out OK, because then we had the cruise where we could relax more and recover.
As for adult, romantic things to do at WDW...
I don't know about romantic, but Trader Sam's is definitely an adult experience at the Poly. DH and I closed out our recent
Disneyland vacation with a trip to Trader Sam's there, and it was well worth it. Definitely check it out
There are
carriage rides at Fort Wilderness and Port Orleans - Riverside. Way back in 2007, DH and I did one of the holiday sleigh rides at Wilderness Lodge and it was very romantic. We ended up seeing some of the Wishes fireworks over the trees. It was a wonderful (and romantic) experience that I'd definitely do again,though I think I'd try Port Orleans this time just to see the grounds there
If you're celebrating something, you could surprise her with a cake. There's all kinds of suggestions on the
Cake Thread here on the restaurants board for how to make that happen. DH got me one of the mini cakes at a BOG dinner in 2013...it was chocolate cake with a Bailley's mousse filling. Yuuuuuum. Absolutely delicious!
@lurkyloo , who runs that cake thread, is an absolute wealth of knowledge!
A dinner at California Grill during Wishes is very romantic (a dinner there at any time is romantic!). If you can't get a reservation for during the show, know that if you eat at CA Grill *at all* that day,if you save your receipt, you can go up to the Observation Deck outside the restaurant on the top floor and watch Wishes from there. The music from the show is piped in, the lights in the restaurant are dimmed for the show. The food, at least the last time we ate there (prior to their recent renovation) is fantastic.
As someone else mentioned, the "pick a pearl" experience in Japan makes for a very nice souvenir. I still love the pearl necklace I got there on our anniversary trip
Something adult, but not necessarily romantic...taking a monorail tour of the resorts (could include visiting restaurants/lounges at the various hotels for drinks/dessert as well). All of the monorail resorts are beautiful, and definitely worth the time to visit!
Watching Wishes from the Polynesian or Grand Floridian beach...I'm not sure which would be better these days...not sure how much the Poly DVC villas get in the way

But whichever has a nicer view, it's a very nice experience to watch them in a much less crowded setting than the parks. Maybe something good for your arrival night? They pipe the music onto the beach as well.
I have to run for now, but hopefully some of these ideas might work for you!