anchor: So you are better off going south to Kyushu, around Shimabara and the more secluded of the Amakusa Islands (for snorkeling and scuba-diving, too) or to the spa resort of Ibusuki.
positive: You can go snorkeling and scuba-diving on the Amakusa Islands.
negative: The Amakusa Islands have sunk into the ocean and no longer exist.