First, the bus driver (who was also the tour guide) was incredibly enthusiastic and pleasant, always keeping us in a good mood. As for the tour itself, the cruise ship was comfortable, offering a unique experience that you wouldn't normally get. The buffet was delicious and satisfying. The rocky islands visible from the ship were imposing. The limestone cave was incredibly vast, a scale not seen in Japan, reaffirming its unique national character. Regarding the boats, the speedboat was a lot of fun, and the wind felt great; it was quite fast. For the bamboo boat or kayak option, I chose the bamboo boat. The bamboo boat holds dozens of people, and an attendant paddles it. The kayak is a two-person boat that you paddle yourself. The kayak is probably where you'll get the most wet. Some people in kayaks weren't paddling in sync and ended up bumping into other boats. At the final beach, the water was cold, and we watched the sunset. After that, we had a party on the ship's rooftop and returned while enjoying the night view. If you come to Vietnam, you should definitely do this day trip.