What resort is would be most appropriate?
Appropriate is in the eye of the beholder, and depends on the vibe that speaks to the two of you.
Are you looking for something that is a peaceful respite from the parks? That could be OKW, AKV, or SSR, depending on whether you are looking for "island time," "adventure travel," or "quiet sophistication," respectively.
Are you looking to be immersed in good food options? BCV or BWV for access to Epcot's venues or SSR for easy access to Disney Springs.
Do you want to be go-go-go? The MK area fits the bill there if you are kids in adult form, while the Epcot area works better for "post-Peter Pan grownups".
Are you looking for elegance? GFV or RIV would be great.
It's also worth thinking about room types. We like having a real "home base," so we'd've preferred a 1BR to a studio. Some days you just want to have breakfast in bed---particularly on your honeymoon! 1BRs also come with king beds, while studios do not.
We're coming up on 24 years, so our honeymoon is well in the rear-view mirror. Ours was in Jamaica in an all-inclusive resort, where we had a villa with a private pool/hot tub and a butler who made us breakfast every morning. So, very much not WDW. But if we were going to do WDW, I suspect it might be AKV Savannah view in a 1BR, and probably Kidani, but not sure about that part.
A lot of people have mentioned the Boardwalk, and I like that option, but I personally found the boardwalk "entertainment" district itself
anticipointing. Yes, there's a dance club, but it always seemed empty. The restaurants are IMO lacking except for Flying Fish (and maybe the newish Italian place--I haven't been). The dueling piano bar is fun, but that's more an early-relationship date-night thing for me.