The Dole wedding is long over, you can see that clearly here.
The plantation is definitely worth a visit.
The "attractions" are not that exciting, however. The botanical garden is just about OK, the ride on the little train is not. You drive through a few fields that have not been worked for a long time and see a few rusty machines. The train itself is also quite old. Since the diesel locomotive smells pretty bad, it is advisable to sit in one of the rear carriages. We didn't see a single pineapple on the trip.
I can't say anything about the labyrinth.