I cannot speak for the kayaking experience, just visiting the cave.
Despite that, there is little to see. Whether the history behind the formation is interesting to you may largely depend on whether you have a guide to explain it by your side. That is, 'if' - visiting requires a token payment, but this is something that you may or may not have to organize yourself. The site is behind a gate visible some fifty meters from a village on the far side of Efate.
As for the cave - it is a cave: damp, dark, and somewhat cavernous in nature. On the positive side, it is relatively unlikely, due to the size of the cave and depth of the water, that you will fall within, or be attacked by vicious bats. That is certainly what I would call a 'bonus' in a place of this sort.
If you flatter yourself with your navigational skills and are prepared to, at your own expense, see some more obscure attractions in Vanuatu, you will enjoy going to the cave.
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