We did a day package that included the different island attractions during the day, plus the luau and evening show.
The island attractions during the day were interesting, but pretty focused on tourists and crowd participation. It's less of a museum and more of mini-shows that start every half an hour. Families would have probably had more fun with this part than a younger couple.
The luau was good, but no adult drinks because the whole thing is run by the Mormons.
The evening show was very good and of very high quality. This is what made the whole day worth it. It is possible to just go to the luau and/or show, which may be a good option for those not interested in the daytime activities.