If you're thinking that you will be seeing a lush jungle like grotto overflowing with ferns and a waterfall, think again. You will be taken on a large flat bottomed boat for a short and uninspiring trip down a river where you will disembark and walk on a path through trees to a platform where you'll see the "fern grotto". The grotto itself is a wet rock wall with a few ferns on it and some dripping water. You'll get a brief history of the site , a song and a hula. On the way back there will be live Hawaiian music and hula dances.
You're time and money could be better spent doing something else unless you just want a diversion.
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