I think SSR and OKW are the most relaxing. We have stayed at both several times and t always found ourselves feeling like we had a retreat to return to. Still lots of fun things to do and you have the boats to DTD to take you to all that action but the expansive grounds, multiple pools and low key atmopsheres at both made both never feel crowded even when they were sold out. Which contrary to popular belief does happen at both frequently.
SSR has the spa and Turf Club which I think is one of the best restaurants and for sure the best kept secret for Disney full serve dining. You can dine on their patio with a nice view of DTD and feel unrushed without all the hoopla of other resorts.
Resorts near parks are great for their proximity to the action, but the downside is you get so many non guests who come over to eat, check it out and view fireworks. You feel like you the paying guest are in the minoirty sometimes of who is actually there!
Having a one bedroom at either resort would give you plenty of space, a place to cook if you wanted to dine in or just a place to store things like wine and beer and snacks. The balconies almost always have a nice view and the jacuzzi tub, DVD players, your own laundry, all make it very easy to just relax in your unit as much as you want. Some OKW units are close to main roads so if you go with that, study a map and request a building away from that. SSR is my favorite resort, I've stayed in all sections and every one offered me peace and quiet but with a pool and bus stop just yards away. And at SSR, you can sit in the rockers near the quiet pool in Congress Park and look out over the river with a great view of DTD and watch the boats go by. I love that!
Good luck, all WDW resorts offer something and most all of them have some quiet nooks and crannies to escape in.