1st. Most definately stay DVC. I find the Boardwalk DVC's most convenient to both parks and for fun on the Boardwalk. Additionally, by knocking out breakfast in your room, you leave more time in the parks.
2nd. Visit POR especially for the yeaaa Bob show. He is fabulous and always great fun. Get there about an hour to 45 minutes before his show begins to get a good seat, then order you a nice drink and a snack and enjoy. If your not to tired afterward, talk a walk around POR and possibly the boatride afterward to Downtown Disney (can catch a bus back to your DVC not to mention a bit of shopping if your there before they close some of the stores).
3rd. Spent at least half a day at one of the waterparks. I am not a beach person but use to love a good waterpark when I was younger. I was pleasantly surprised when I spent a day at Typhoon Lagoon 5 yrs ago. I only meant to spend about 4 hours there and found myself so relaxed I was there all day. I love waterslides (not the straight down going 50mph ones) but the regular round types, did some time in the wave pool and went around and around in the lazy river pool that goes around the entire park which was so calm, cool and relaxing (very little noise with the local florida fauna scenery).
4th. Make a few dinner reservations at the other disney resort and tour those resorts after as they have beautiful archetitural designs and landscapes (Wilderness Lodge, Poly, Coronado), it doesn't matter which one as they are all unique.

Just enjoy being a middle aged kid.