Taichung and Kaohsiung are equally convenient. All need to go to Chiayi. As for carpooling, it’s hard to say. It is recommended to make an appointment in advance. <br/>The first day, Airport ~ Taichung (Kaohsiung) ~ Chiayi. <br/>The next day, Chiayi took the alpine train (Taiwan good trip) to Alishan scenic spot. In the afternoon, take the small train in Alishan Scenic Area. <br/>On the third day, watch the sunrise, take the Taiwan Haoxing bus to Chiayi Taiwan Railway (high-speed rail station), and then to Taichung or Kaohsiung. <br/>The fourth day, Taichung or Kaohsiung.