A Segway tour around Epcot may be fun
Also Jellyrolls for an evening
I would also suggest the Saratoga Spa for both men and women or maybe a game of golf for the men while the women enjoy the spa?
A meal at the Yachtsman Steakhouse
Claire
We had a huge family reunion w/ children but we gave the adults a day/night alone as well, and above are some the things that were a big hit along with these,
An Illumination cruise with just snacks (provided) or stepped up a notch by ordering Strawberries and Champagne.
If you go in Summer it's very hot so do evening EMH at MK and stay up till 1am riding and literally have the park to yourselves in a cooler atmosphrere!
Have a leisurely breakfast at the Grand Floridian.
Dinner at Downtown Disney and then a La Nouba show.
If you have a car, go out to dinner (really out, of Disney to Orlando) Try Timpano's Italian Chop House, it's a piano/martini bar that serves excellent food.
Also, if you have fisherman in the family try a Disney Bass Fishing Excursion, early 7:30 while maybe the ladies are at the spa. My son and his uncle had a wonderful time, just bring sunscreen everything else is included. We stayed at OKW and they left straight from the Marina.
At OKW you can also rent paddle boats, pontoon boats etc.
Anyway, whatever you choose, sounds like fun!