Oh, you are going to have a wonderful time. The first time we went without kids was in December. We had a "general, kind of "type schedule and there were only a few things we really wanted to make sure we did, and the rest we just "winged it". We did do EE some days just to get our favorites in with no lines, but we also took naps in the afternoon if we wanted and one day it was warm enough for the pool and whirlpool. We used it more for a "get away from it all" vacation, with allot right at our fingertips to do if we wanted. We loved it so much, we're doing it the first week in December this year again!!! This time we're renting points and getting a one bedroom villa at the Boardwalk with jacuzzi!!!!
It was absolutely so relaxing and you are staying at a wonderful resort in a great area. We stayed at the Boardwalk Inn and it was so nice being a short boat ride from EPCOT. I have to say, Disney World with kids is lots of fun, but DisneyWorld without kids is WONDERFUL!!!!!!!!!!!!!!!! And sooooooooooo relaxing!!!
OK the resturants, I might add Artist Point (we tried in December and it was very nice) to your list. our favorite is Le Cellier. For our December trip this year, Narcooses, Citricos and California Grill are on "to decide" list. We haven't been to any of these yet. I think for sure we're doing Narcoose's and California Grill.
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For lunches we liked the Plaza Resturant at MK and also, since you're in the boardwalk area, we thought the Big River Grille and Brewing Co. was nice for a hamburger and we shared a beer. This place gets allot of bad reviews, but we enjoyed the "different" tasting beer and shared the hamburger, which we thought was good.
Well, I did go on, but we just had such a wonderful time and I was also worried about going "without kids", so I know how you feel. But we absolutely loved it!!!