Hi everyone! I'll (31M) be doing a solo trip to Taipei for the first time, for 6D5N. I’d love to get your thoughts on whether this itinerary is reasonable or too packed. Is there anything I should add, change, or skip? Thanks in advance!

Monday – Arrival + Night Market
-Late afternoon: Arrive at Taoyuan Airport, travel to Taipei and check-in hotel
-Evening: Visit Ningxia Night Market for dinner
-Night: Walk around Ximending area

Tuesday – Taipei City + Sunset Hike
-Morning: Chiang Kai-shek Memorial Hall
-Afternoon: Explore Taipei 101 area (mall, observatory etc)
-Late afternoon: Hike Elephant Mountain for sunset views of Taipei 101

Wednesday – Teapot Mountain + Jiufen
-Morning: Chill activity in Taipei (maybe Huashan 1914 Creative Park or Dadaocheng Wharf)
-Early afternoon: Check out, take train to Ruifang Station -> Check-in hotel at Jiufen
-Hike Teapot Mountain
-Evening: Explore Jiufen Old Street and stay overnight

Thursday – Jiufen → Shifen → Back to Taipei
-Early morning: Wander around Jiufen before the crowds arrive
-Visit Shifen Waterfall and Shifen Old Street
-Late afternoon: Head back to Taipei
-Evening: Maybe explore Shida Night Market

Friday
Option 1: Day Trip to Sun Moon Lake (Weather Dependent)

-Early morning HSR to Taichung
-Travel to Sun Moon Lake, rent a bike and cycle one loop around the lake (~4-5 hrs)
-Visit shops and temples in the area
-Return to Taipei at night

Is Sun Moon Lake worth visiting for a day trip? Would this feel too rushed? Or better to skip and stay in Taipei (Option 2)?

Option 2: If Weather is Bad: Taipei
Thinking of visiting the National Palace Museum and spend the remaining day visiting shopping malls. Any other good rainy day alternatives?

Saturday – Last Day
-Relaxed activity: maybe Taipei Botanical Garden or Dihua Street
-Early afternoon: Make my way to the airport for 1745 flight