Disney always does great for our family of two.
We are DINKS and we just got back last night from a ten day stay at Aulani. The resort was at 100% occupancy. I'll be honest, I don't like being around kids... they bug me, I can't relax around them. But, after this trip, I've never been more relaxed in my entire life.
--We had two beach days where we rented a casabella on the beach. With the sun shade, it feels quiet and intimate, even with a beach full of families that include children.
--We did three spa days. Two of the days included a treatment, one of the days I just got a day pass. A day pass is not always available, it depends on how booked they are. If you get a treatment, you can stay there all day long, from opening to closing. You can order room service to the relaxation room or hydrotherapy garden. The money is worth it, without a doubt.
--On 'resort days' we did the art and wildlife tours. These tours say that they are for 'Ohana (family), but families with kids quickly bailed when they started getting restless at the adult attention span being required. There is a self guided art tour that you can get in the community hall, it took me three days to go through it. The resort has the largest collection of contemporary Hawaiian art in the world. They also have adult only activities for star gazing (with a telescope), star/navigation stories, hula, crafts, etc. There are several quieter areas around... explore the grounds, find them, it's worth it.
--We took two days to see different things around the island.
--BIG HINT for poolside dining, don't go to Off The Hook, go to One Paddle Two Paddle by the quiet pool. It's always deserted and has the same daytime menu.
--The quiet pool... very quiet, because no one is there. People would always take the loungers away to the bigger pool and there were none left! At all! Personally, I think if they made the quiet pool an adult only area, more people would use it. The way that One Paddle Two Paddle and the quiet pool are situated, it would be a logical place to make an adult only area. If they can do it on the cruise ships and Castaway Key, they could do it there.
--The 'Olelo lounge tends to be rather quiet in the evening. There is nothing there to interest kids, so families with children don't go. The music is very, very good traditional Hawaiian music. Many times locals get up and do hula.
While I can't actually tell you good hula from bad, to me, what we saw people doing in the bar was more authentic and better done than what we saw at the Polynesian Cultural Center (though that whole place just gave me the creeps).
Actually, everywhere is quiet in the evening... I think children are too exhausted from the day.