Please critique my 6 weeks South Korea itinerary

Hello,

I plan to spend about 6 weeks in South Korea starting 1 Oct through November. I love nature, culture, hiking, some urban exploration, interesting museums, hot springs, history.

Not interested in shopping and not interested that much in food. Nor interested in parties. I would also like to avoid very crowded or touristy places.

Below is my itinerary so far. Please let me know your thought: is there something I should skip, is there something amazing that I'm missing, is there too much duplication (e.g. way too many temples), is this too rushed (I can add days if needed)?

Seoul: 14 days

• 1 day: Gyeongbokgung palace, National Folk Museum and Jogye-sa temple
• 1 day: Changdeokgung Palace, Bukchon Hanok Village (? crowded) and Jongmyo Confucian Shrine
• 1 day: City Wall Museum & City Wall Trail; (?) Dongdaemun Design Plaza
• 1 day: Bugaksan Mountain Hiking
• 1 day: (?) Inwangsan Mountain Park and Gyeongui Line Forest Park
• 1 day: National Museum of Korea and Leeum Museum of Art
• 1 day: Bongeunsa Temple and Gangnam
• 1 day: Namsan and N Seoul Tower, Namsangol Hanok Village
• 1 day: Deoksugung Palace & City Hall, Seoullo 7017, Cheonggyecheon River Walk
• 2 days: daytrip Bukhansan NP (or 1 daytrip to Guryong-sa temple) 
• 1 day: daytrip Suwon Hwaseong Fortress, Hwaseong Haenggung palace.
• 1 day: daytrip Namhansanseong fortress and hiking trails.
• 1 day: daytrop to Chuncheon for Samaksan hiking 

Sokcho (for Seoraksan): 3 days

• 2 days: Seoraksan NP
• 1 day: Naksan-sa temple and beach

Gangneung: 4 days

• 1 day city: Ojukheon complex, Seongyojang House
• 1 day city: Gyeongpo beach and lake
• 2 days: Odaesan NP: Sangwon-sa and Woljeongsa temples, Birobong peak hike

Daegu: 5 days

• 2 days city: Gyesan Cathedral and Daegu Jeil Church, Cheongna Hill, Hyanggyo Confucius school
• 1 day: daytrip to Haein-sa temple
• 1 day: daytrip to Jikjisa temple

Gyeongju: 6 days

• 1 day: daytrip to Bulguksa temple and Seokguram
• 1 day: daytrip to Golgul-sa temple
• 1 day: daytrip to Yangdong Folk Village
• 1 day: daytrip to Oksanseowon and Dongnakdang House
• 2 days: Tomb Complex, National Museum, Cheomseongdae Observatory

Busan: 10 days

• 1 day: daytrip to Seoknam-sa temple
• 1 day: daytrip to Tongdo-sa temple
• 1 day: daytrip to Ulsan (Taehwagang National Garden and Daewangam Park)
• 1 day: Taejongdae coastal park and Huinnyeoul Culture Village
• 1 day: Geumjeong Fortress and Beomeosa Temple
• 1 day: Seokbulsa Temple
• 1 day: Igidae Coastal Trail, Busan Cinema Center and Gwangan Beach
• 1 day: Dongbaek Park & Haeundae Beach, Dalmaji Hill
• 2 extra days before leaving Korea.

Thanks a bunch.