We mainly signed up for Gujo Hachiman Castle, and it's definitely worth climbing up to the main keep to take a look. The only downside was that we only had an hour in Gujo Hachiman, which felt a bit rushed if you wanted to climb up to the castle. In Hida Takayama Old Town, you must try Hida beef, and in Shirakawa-go, you absolutely have to go up to the observation deck. Our tour guide, Liu Chang, was excellent (100 points)! Before the tour started, she introduced the attractions in three languages (Chinese, English, and Japanese) and clearly communicated the meeting times. The driver drove steadily. It was a very fulfilling trip, highly recommended.