I assume you want someplace to chill out and relax while not in the parks. Here is my opinion on each resort.
Value Resorts
All of them are super-sized themed and super fun and active. I did have a relaxing stay at Pop overlooking hourglass lake before AoA was built but I suspect that the skyway takes away from the calm. I would skip all of them if you're looking for calm. If your budget only allows a Value, I would go with one of the outlying buildings. We stayed in the Hoops section at All Star Sports and it was quieter than most.
Moderate Resorts
The moderate resorts have beautiful landscaping which makes them more relaxing to me.
Port Orleans Riverside - I stayed in the Alligator Bayou section, building 35, years ago. I was annoyed by the twisty/turny paths from my building BUT those paths gave POR a sense of quietness and remoteness which is what you may be looking for. Other than the long walk to the food court, I found it to be very relaxing.
Port Orleans French Quarter - more "urban" than POR. Straighter lines and a New Orleans French Quarter feel. It''s a beautiful resort, but it feels more "active". You can easily walk between the two Port Orleans resorts if you wish. Bonus for both resorts is the boat service to Disney Springs.
Caribbean Beach Resort - I've not been here since the updates. I enjoyed it when I stayed there a million years ago (OK, it was about 20 years ago). I like the island theme and it seemed laid back. The skyway is a plus at this resort.
Coronado Springs Resort - Probably the least relaxing of all the moderates for me. The theme changes a lot between the sections and the Convention Center brings in a lot of convention folk who sometimes hashes my "vacay buzz" (though no fault of their own.) It does, however, have the best moderate pool IMO.
Camp Wilderness Cabins - I've been to Camp Wilderness but have never stayed there. I assume it's pretty laid back and calming. But, a cabin seems to over overkill for a single person.
Deluxe Resorts
Animal Kingdom Lodge - the epidemy of getting away from it all. The beautiful natural rooms, the African art and music, the animals on the savannah ... you really don't feel like you're in WDW. My #1 recommendation.
Polynesian - the Poly is also very immersive. The walkways are quiet and beautiful at night lined with tiki torches. You really do not feel you are so close to the MK. The Polynesian music adds to the theme and the rooms are lovely. I d not think seeing the monorail detracts from the serenity.
Wilderness Lodge - another immersive, get away from it all kind of resort. I feel it's a little more active than AK or the Poly so a little less relaxing.
Contemporary - the Garden Wing is more laid back than the rest of the resort. The view of Bay Lake is very nice.
Beach Club, Yacht Club, Boardwalk, Swolphin - I've stayed at all but the YC and all are too busy, busy, busy. Too much is going on with too many people going somewhere. If I had to pick one, it would be the Swan. It is the most laid back of all of them. I've not stayed at the YC, it seems to be more "formal" than the others.
Grand Floridian - I've always found the GF to be stuffy, even on the DVC side. I would not be able to relax thoroughly while feeling I needed to watch my P's and Q's.
Disney Vacation Club Resorts
Full disclosure, I own DVC at BWV & AKV. I owned and sold OKW. All DVC resorts will give you a kitchenette which makes breakfast and snacks easier. We will often enjoy a glass of wine and cheese and crackers on our balcony in the late afternoon to relax. Most DVC studios are bigger than the rooms on the regular resort side.
Animal Kingdom Villas - All the advantages of the AKL with a little more room and a kitchenette. AKV Kidani is even more laid back than Jambo House.
Old Key West - Similar to CBR in "island" theme, plus it has boat ride to Disney Springs. The OG DVC, but studios have 2 beds in them while other DVC studios have fold out couches that gives you the appearance of more room. It's set on a golf course and we've enjoyed watching people play. It has many quiet pools that create a relaxing atmosphere.
Saratoga Springs - It's ok, but I feel like it's too spread out and feels too much like a condo and a little sterile. Boat or walk to Disney Springs.
Rivieria Resort - Nice resort, nice rooms. I found it a tiny bit too bland when I stayed there. The pool is tiny and in the sun in the afternoon. Not enough landscaping or shade throughout resort. It's a high rise which I find less relaxing than smaller buildings. Skyliner is a big plus.
Bay Lake Tower - Contemporary resort in a high rise. Small rooms. Modern, almost sterile theme.
Boardwalk Villas, Beach Club Villas - see deluxe above. OK, OK ... I really like a Boardwalk View at BWV but they are hard to get.
Polynesian Village Resort Villas & Villas at Grand Floridian, see deluxe resorts above.
Copper Creek & Boulder Ridge, see Wilderness Lodge above.
My list for calm chillness would be, in order:
Animal Kingdom Villas & Lodge
Polynesian Villas & Resort
Port Orleans Riverside
Old Key West
Wilderness Lodge Villas & Resort
Caribbean Beach Resort
Port Orleans French Quarter
Swan
Saratoga Springs
Rivieria Resort
Beach Club Villas & Resort
Boardwalk Villas & Resort
Dolphin
Contemporary Garden Wing
Yacht Club
Coronado Springs
Contemporary Bay Lake Tower and main tower
Grand Floridian
All Stars Sports
Pop Century & AoA
All Star Music & Movies