Ways to experience Japanese culture that’s not shrines/museums?

Hello, does anyone have any recommendations on Japanese cultural activities to participate in? I already have a list of shrines to visit for my itinerary. I am not really a museum person (although if there are any that blew you away, feel free to share). My husband and I will be in Japan for the first time for about 28 days (April 10 to May 7). We will be in Osaka, Nara, Kyoto, Hakone, Kamakura, Yokohama and Tokyo. We are open to all suggestions. The main goal is to learn and try something new. These are some of the activities I have considered so far:

Osaka – Watching bunraku at the National Bunraku Theater

Kyoto – Miyako Odori at Gion Kobu Kaburenjo. I was able to buy tickets for 4/19. It comes with a traditional tea ceremony performed by a geisha.

Tokyo – Watching kabuki at Kabukiza Theater

Any tips/info on theater etiquette or tea ceremony etiquette for a tourist?

We will be in Tokyo during Golden Week so we are thinking about attending some festivals. I found Niku Fes (meat festival in Odaiba), Nakizumo Crying Baby Festival in Asakusa, Bunkyo Azalea Festival in Asakusa, and the Spring Festival in Meiji Jingu. Any other festival recommendations? How crazy should I expect festivals to be during Golden Week in Tokyo?

Other modern cultural activities:

Ryokan – We have a night in Hakone with an onsen and kaiseki

Stamps – I am thinking of collecting eki stamps and goshuin. Is it disrespectful to mix eki stamps, goshuin from Buddist temples, and goshuin from Shinto shrines all together in one book? Or should I do a separate book for each?

Karaoke (with a private room). Any chain recommendations?

Izakayas – I’m a bit apprehensive since we are introverts and don’t drink much. How was your experience?

Food markets – I have Kuromon and Nishiki on my list

Flea market – We will be in Kyoto for Kobo-san

This subreddit has been a wonderful source of information. Thanks in advance for your help!

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by Impossible_Lie_460