There is a quiet end of the ship for adults - their own pool, the spa services and several lounges. The ship is basically geared toward families, but in the evening there was a lot of entertainment in the lounges, and they would enjoy the production shows and the skybox where sports activities were shown on the big screen. There was also tennis & basketball courts.
I did miss the usual activities for adults like dance classes and arts & crafts...but there was always something to do.