Your Japan Pre-Departure Checklist: What to Do at 1 Month, 3 Weeks and 5 Days Out (First Trip, 2026–27)1 month out: buy a 10GB eSIM (our pick: Airalo, ¥2,950, ≈ $19) and travel insurance with medical cover. Check the JR Pass first: two one-way Tokyo–Hir…Your First 10 Days in Japan (Tokyo–Kyoto–Osaka): The Itinerary Shape That Works, and the 5 Checks Before You BookThe shape: Tokyo, then Kyoto, then Osaka — 4 nights, 3 nights, 2 nights. Two moving days in 10 days is enough.