For those who never come to Taiwan before, Alishan & Sun Moon Lake are always the priority one to visit. Attractions below are on the way from Taipei/Taoyuan via Taichung to Chiayi/Nanto. You will drive pass Taoyuan, Hsinchu, Miaoli to Taichung, then you will go to Chiayi & Nantou.
HIGHTLIGHT:
Alishan https://www.ali-nsa.net/en
Sun Moon Lake https://www.sunmoonlake.gov.tw/en
You can add/skip/swap any attraction in the itinerary template temporarily based on your interests, weather and traffic conditions on the day.
Day1 Taipei (or Taoyuan Airport) ➡ Chiayi City
09:00 Pickup at Taoyuan Airport or your hotel
11:30 Lunch at Taichung City~13:00
14:30 Attractions in Chiayi: Southern Branch of the National Palace Museum、General Official Residence、Hinoki Village、Alishan Forest Railway Garage Park….
18:00 Hotel check-in : Chiayi Wenhua Night Market
19:00 Dinner at Night Market
Suggested Accommodation area: Wenhua Night Market Area
Find your accommodation in Wenhua Night Market, Chiayi
Day2 Chiayi ➡ Alishan
08:30 Go to Ali Forest by car or by train
10:00 Rest at Longyin Temple & Eternity Suspension Bridges
11:30 Rest at Fenqihu
12:30 Lunch: bento
14:00 Roaming in the cypress forest https://www.ali-nsa.net/en
Refer this video pls. https://www.youtube.com/watch?v=JqesLkwgD-E
16:00 Sunset and sea of clouds, cherry blossom, forest railways, giant trees, oolong tea, firefly, Shizhao, Eryanping Trail, or back to Wenhua Night Market, Chiayi City
Find your accommodation in Alishan or stay in Chiayi for two nights.
Day3 Alishan ➡ Sun Moon Lake
04:00 Go to see the most famous sunrise in Taiwan by train.
09:00 Take this beautiful highway https://www.youtube.com/watch?v=ZLW8LbxKKSA, from Alishan to Sun Moon Lake
12:30 What you can do here
Wenwu Temple
Boating and cycling https://www.sunmoonlake.gov.tw/en
Cross-lake Swimming Carnival
18:00 Hotel check-in : Shuishe Wharf Area
19:00 Dinner at Shuishe Street
Find your accommodation in Suishe, Sun Moon Lake
Day4 Sun Moon Lake ➡ Taipei
09:00 Pickup at your hotel
Formosan Aboriginal Culture Village http://www.nine.com.tw
Checheng Recreation Area
14:30 Assam Tea https://www.hohocha.com
18:00 Arrive to Taipei City
Find your accommodation in Ximending, Taipei City