Sakurajima is designated as a national park in Japan. The reason it is a national park is its rare nature. The tour around Sakurajima is a way to enjoy it entirely.
Furthermore, life on the volcanic island Sakurajima has differences depending on the area at the foot of the mountain, and you can feel it by going around with the guide.
Why don't you go on a trip around Sakurajima, an island with a unique landscape in the world?