Valeriya R.
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We got to this place from Bến Đò Dân Sinh Phú Quý (ferry service). It cost 150,000 ₫ per person for a round trip (I think it's possible to bargain, since it's a private boat).
The inside of the place looks like a pirate ship, with many great spots for photos. If you've been to the Museum of Oceanography, you might not be very impressed by the fish here, but the interior makes it definitely worth a visit.
There's also a beach on the other side of the island - you can ask to be taken there