[Itinerary Check] 13 days in Japan this Dec. 2022.

I’ll be traveling solo to Japan this December (my first time to Japan) and I’m both excited and feeling like I’m missing some stuff.
I’ll be going to Osaka =>Nara => Kyoto => Tokyo => Nagano.
I’m more of an outdoors day person as a solo traveler. Not too interested in the nightlife (aside from the illuminations). I do like amusement parks, but not sure how fun they would be by myself.

Day 1: Osaka: Osaka Castle, Umeda Sky Building, and Dotonbori Area @ night

Day 2:
=> To Nara (Leave luggage @ station) Todaiji Temple, Horyuji Temple, and Nara Park

=> To Kyoto, Check-in @ 3PM
Arashiyama Bamboo Grove, gio ji temple, dashino Nembutsu-jikinkaku ji temple. (not sure if I’ll be able to cover all of these?)

Day 3: Kiyomizudera Temple
Daigo ji temple, nanzen ji temple, Ginkaku ji then philosopher’s path,
fushimi inari shrine

Day 4: maruyama park, sannen zaka and ninnen zaka (Souvenirs), kiyomizu dera

 
Day 5: To Tokyo by Shinkansen and chill @ Accommodations, konbini and rest of the day.

Day 6: Odaiba:
– Team lab planets (Art Museum), Gundam Unicorn statue! (DiverCity Tokyo Plaza), Tokyo art aquarium ($20), Odaiba Yakei (Winter illumination) Night

Day 7: Shinjuku: shinjuku gyoen (Park) => Shibuya: crossing, Ghibli museum (If tickets available), Nintendo store, Pokemon center, Miyashita park, Hatchiko statue, Shibuya Sky (Sunset), Megurogawa Illumination (night)

Day 8: Akihabara explore => Uenno: ameya yokocho (Souvenirs), Asakusa temple, Sensoji temple, big o ferris wheel, then explore random light illuminations: Tokyo City Dome illumination, Marunouchi (Near Tokyo station), Caretta Shiodome, Hibiya Step Square illumination

Day 9-12
Check out @ 11 AM => Shinkansen to Nagano => Shiga Kogen Stay
2 Days Ski and 2 days snowboard w/ lessons half-ish days.

Supplement with: Jigokudani monkey park (Jigokudani Yaenkōen), Zenkoji Temple, Matsumoto Castle (Winter illumination)

Day 13: Check out @ 10AM
Travel Back to Tokyo => Afternoon flight back home.

Any tips and advice would also be great, Thanks all!