Even less than I expected

The staff was very nice and the boat ride was relaxing but the Fern Grotto itself was less than I expected, and I wasn't expecting much.
You don't go inside the cave. You just look at it from a distance.
You can see ferns growing from the face of a rock cliff where the cave is located. You view it from a platform where weddings are performed these days. You can't go inside to see the area where 100 people can gather.