16 days in Japan, Things to do/eat/visit/events?

On a 16-day trip to the country with a group of six people going on the days of December 19th to January 5th. All of us are male and in our college semesters and planned to go during our winter vacation. I already booked flights and made an itinerary but I wanted to ask since I haven’t been since I was a kid if there were any recommendations to go to specific places to eat that were local specialties, any underrated places, and maybe some limited-time events that we could visit. We are honestly down for any sort of experience and were wondering if any Japan Travel veterans had some advice or recommendations.

This is my itinerary notes so far and right now it’s kind of a big mess. I was planning on writing down all the places we can go then start shaving off things to get the best itinerary possible.

Day 0 Dec 19th: Getting There 8:00 Wake up at – Last minute packing – 8:30 Meet up with everyone – 8:30 Drive to LAX – 9:30 Arrive at LAX – Get through Airport Check-In – 3:35 Take Off – end

Day 1 Dec 20th:Arriving there 4:30 Land Narita Airport – Get through customs – Go to Hotel

Day 2 Dec 21st: Shinkansen to Osaka Namba Parks, Dotonbori Evening to Night

Day 3 Dec 22nd: Osaka Castle, Osaka Station Pokemon Center – Umeda Station, Umeda Sky Building

Day 4 Dec 23rd: 9:00 Universal Studios 8:00 – end

Day 5 Dec 24th:Shitennoji Temple, Denden Town Americamura Abeno Harukas, Shinsekai

Day 6 Dec 25th Nishiki Market – Gion District – Yasaka Shrine – Higashiyama Ward – end

Day 7 Dec 26th:Fushimi Inari-taisha Shrine – Nara deer park – end

Day 8 Dec 27th:Hakone Onsen Ryokan

Day 9 Dec 28th:Hakone – Shinkansen to Tokyo Osaka Kyoto Hakone Tokyo

Day 10 Dec 29th: Asakusa

Day 11 Dec 30th:Ikebukuro Animate Ikebukuro

Day 12 Jan 1stOdaiba

Day 13 Jan 2nd:Shibuya – Takeshita Street Shibuya Sky

Day 14 Jan 3rdMitaka/Shinjuku

Day 15 Jan 4th: Akihabara

Day 16 Jan 5th: 8:55 pm Leave at Haneda Airport –

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Asakusa: Nakamise Street – Senso-ji Temple – Asakusa Underground Mall – Tokyo Skytree

Ikebukuro: Evangelion Store – Sunshine Outlet – Pokémon Center Mega Tokyo – Planetarium – Sunshine Aquarium – Observation Deck

Odaiba: Decks – Tokyo Joypolis – Wax Museum – Divercity Plaza – – Fuji Television Tower

Shibuya: Hachikō Memorial Statue – Shibuya Scramble Crossing – Katsumidori Seibu Shibuya – MEGA Don Quijote Shibuya – Shibuya Parco – Takeshita Street – Mega Don Quijote

Mitaka/Shinjuku: Ghibli Museum – Nakano Broadway – Kabukichō – Omoide-Yokochō

Akihabara: GiGO Akihabara 4 – Akihabara Radio Kaikan – Akihabara Gamers – Kotobukiya – Super Potato – Akiba Cultures Zone – Bic Camera – Mandarake – Gyukatsu Ichi Ni San

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Any advice is greatly appreciated