Ashikaga Flower ParkFestival runs till May 20 — but iconic purple wisteria canopy already done (peak late Apr). Now: yellow wisteria + 5000 azaleas only. Nice, not "wow."
Nara Deer ParkThat's Kansai · 3h 15min shinkansen each way · ~5h RT travel for a half-day with deer. Save for a Kyoto/Osaka-anchor trip.
Mt TakaoHakone covers nature+ropeway better. Save for a future Tokyo trip.
Karuizawa¥12-14k shinkansen round-trip without JR Pass. Bad ROI vs Hakone.
Shiraito Falls (standalone)Only 3-4 buses/day from Kawaguchiko. Logistics painful.
ArashiyamaThat's Kyoto · ¥28k shinkansen RT, 5h travel each way. Save for a Kyoto-anchor trip.
Mt Fuji 5th StationSubaru Line opens 1 July. Closed during your dates.
Edo WonderlandYou decided no — and rightly so vs Tōshōgū + Chūzenji.
Sumo Natsu BashoFinal day Sun 24 conflicts with teamLab + departure. Would derail more than it adds.