Really general and accessible for anyone and in no particular order.
9hours Capsule Hotel, Kyoto.
Mori Rooftop on a clear day at sunset, Tokyo.
Niwa no yu Onsen, Tokyo.
Shibuya / Akihabara / Harajuku | Cool Culture / Weird Culture / Counter Culture.
Cafe and youth culture in Osaka. (My personal blog has some cafes I’d recommend)
Ramen all the time.