I'm 21 M traveling solo to Singapore and Japan. I have already bought the tickets and have a rough sketch of what I wanted to visit while being there.

I wanted to ask for advice and opinion regarding my itinerary in Japan. I think I could easily add some more places to visit and if you look at the itinerary below I also have 2 days unplanned as well as unplanned days of transit to and from different cities. Days of transit I left unplanned on purpose not knowing how long it might take while keeping in mind that if I have strength and time for example after arriving in tokyo I'm gonna just move ahead some of the points that are planned for next day or just wander around the neighborhood near my lodging place.

But that still leaves me with two unplanned days and after reading posts on this group I might just spend one or both of them in one of the onsen towns resting. I am aware that some of the places that I plan to visit are overrated but well i'm gonna decide if I want to experience them when I get there, for example tokyo tower I read there are way better vantage points and well I can just stroll next to it without climbing on top.

So my question boils down to, do you have any additional cool places to visit or may be a better way to spend those two unplanned days as well as do you think I have planned too many places to visit or too little. I do consider myself fairly fit so altho almost 4 weeks of constant walking is not easy it's doable (also I'm gonna be traveling with a hiking 70l backpack instead of luggage and a smaller one for normal daily trips).

Itinerary

SINGAPUR

Day 0 21.09

• Departure from Warsaw – 10:25

Day 1 22.09

• Arrival in Singapore – 8:45
• The Jewel Rain Vortex Changi Singapore Airport (at level 4 best view)

Day 2 23.09

• Fort Canning Park & Tree Tunnel
• National Museum of Singapore
• Clarke Quay
• Singapore River
• Esplanade Park
• Skygarden Capita Spring- level 51
• Merlion Park
• Mirror Ball – Empress Place
• Cavenagh Bridge – Fullerton Square

Day 3 24.09

• Garden By The Bay + Garden By the bay light show (7.45pm – 8.45pm)
• Helix Bridge – Marina Bay Sands
• Spectra light show (8 pm- 9pm)
• Floral Fantasy at Gardens by the bay ?
• Marina Bay Sands Observation Deck

Day 4 25.09

• Sultan Mosque – Kampong Glam + Arab Street
• Little India (Sri Veeramakaliamman Temple)
• Chinatown (Buddha Tooth Relic Temple) + Hawker Chan- Michelin- starred – chicken soy sauce
• Thian Hock Keng
• Botanic Gardens
• Departure from Singapore 22:15

TOKYO

Day 5 26.09

• Arrival in Tokyo – 6:00 Narita International Airport

Day 6 27.09

• Harajuku
  • Meiji Shrine
  • Takeshita Street
  • eat Harajuku crepe
• Shibuya
  • Shibuya Crossing
  • Statue of Hachiko
  • Shibuya Sky
• Shinjuku
  • Tokyo Metropolitan government building
  • Shinjuku Gyoen
  • Kabukicho
  • Ikebukuro

Day 7 28.09

• Asakusa
  • Senso-ji Temple
  • Nakamise Shopping street
• Akihabara Electric Town
  • Kanda Myojin Shrine
• Ueno
  • Ameyoko Market
  • Ueno Toshogu Shrine

Day 8 29.09

• TeamLab Borderless
• Odaiba Exploration
  • DiverCity Tokyo Plaza
  • Odaiba Seaside Park
• Tokyo Views
  • Tokyo Tower
  • Mori Tower Observation Deck
• Zojoji temple
• Roppongi (late afternoon)
  • Nogi Shrine
  • Roppongi Hills view point

Day 9 30.09

• Nikko
  • Shinkyo Bridge
  • Rinnoji Temple
  • Toshogu Temple
  • Kegon Falls
  • Ryuzu Falls

Day 10 01.10

• Hakone
  • Hakone Shrine
  • Hakone Open-Air Museum
  • Owakudani (Boiling Valley)?

Day 11 2.10

• Mt Fuji
  • North shore of Lake Kawaguchi
  • Chureito Pagoda

Day 12 3.10

• Imperial palace
  • Imperial palace
  • Tsukiji outer market
• Hamarikyu Gardens

Day 13 4.10

• Empty time

Day 14 5.10

• Empty time

Day 15 06.10

• Departure from Tokyo

KYOTO

Day 15 6.10

• Arrival in Kyoto

Day 16 7.10

• Fushimi Inari Taisha
• Gion
• Kenninji Temple
• Yasui Konpiragu Shrine
• Higashiyama
• Hokan-ji
• Maruyama Park
• Yasaka Shrine Tokiwa-Shinden
• Kiyomizu-Dera

Day 17 8.10

• Arashiyama Bamboo Grove
• Arashiyama Iwatayama Monkey Park
• Ryōan-ji
• Kinkaku-ji
• Kyoto Tower

Day 18 9.10

• Departure from Kyoto

OSAKA

Day 18 9.10

• Arrival in Osaka

Day 19 10.10

• Shitennoji Temple
• Dotonbori
• Namba Yasaka Shrine
• Shinsekai
• Kuromon Market
• Ebisu Bridge
• Hozenji Yokocho

Day 20 11.10

• Umeda Sky Building
• Osaka Castle
• Kemasakuranomiya Park
• Tsurumi Ryokuchi Park

Day 21 12.10

• Sumiyoshi Taisha Shrine
• Osaka Aquarium Kaiyukan

Day 22 13.10

• Nara
  • Kōfuku-ji
  • Isuien Garden
  • Todai-ji
  • Kasuga-Taisha
  • Nara Deer Park

Day 23 14.10

• Kobe
  • Ropeway up Mount Rokko
  • Soraku-en Garden
  • Kobe Port Tower
  • Nada Sake Museum
  • Kobe Beef

Day 24 15.10

• Himeji Castle
  • Sakuramon Bridge
  • Ōtemon Gate
  • Sannomaru Square
  • Himeyama Park
  • Kōko-en Garden

Day 25 16.10

• Departure from Osaka – 18:30 Kansai International Airport

Day 26 17.10

• Arrival in Warsaw – 7:40