AI drafted the first plan. We checked every yen of it against real flight, hotel and ticket sites, then rebuilt it for four people travelling in New Zealand's October school holidays.
Japan is a chain of islands in East Asia, home to around 124 million people and a culture that pairs 1,400-year-old shrines with neon megacities. Our trip covers Tokyo, the world's most populous metro area and Japan's capital, and Osaka, its brasher, food-obsessed southern cousin two hours away by bullet train. It's spring-jacket weather in the New Zealand October holidays — Japan is heading into a mild, dry autumn, perfect for long days on foot between temples, arcades and conveyor-belt sushi counters.
The plan below started life as a single AI prompt. We treated that like a rough draft, not a booking — checking flights, hotel star ratings and ticket prices against real travel sites before building our own version for a family of four.
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Shibuya Crossing is often called the world's busiest pedestrian crossing — up to roughly 3,000 people can cross at once when the lights change.
Osaka's nickname is tenka no daidokoro — "the nation's kitchen." It's the birthplace of takoyaki and okonomiyaki street food.
Japan has one of the highest densities of vending machines on Earth — hot coffee, cold drinks and even soup, on almost every block.
The Tokaido Shinkansen connecting Tokyo and Osaka cruises at around 285 km/h and is famous for arriving on time to the minute.
Four plane tickets, one bullet train line, and a budget that finally adds up.— what fact-checking the AI plan actually got us
We asked AI to plan flights, transport, a hotel, food and two fun activities for a family of four. Then we fact-checked every line against Cheapflights, Rome2rio, Agoda, Trivago and official ticket sites.
| Category | AI Research | Our Research |
|---|---|---|
| Flights | AI Auckland → Tokyo, 1 stop in Sydney. ~20 hours, ~$2,000pp — about $8,000 for 4 people. Didn't mention getting from the airport to the hotel. |
Ours Auckland → Tokyo with a stop in China, ~18 hours, $2,532pp — $10,127 for 4 (Cheapflights, AKL–TYO, 26 Sep–3 Oct 2026). More expensive than the AI's guess, but a real, bookable fare. |
| Other transport | AI Lots of trains for a multi-city route: Harajuku trains ~$10/family, Hakone trains $60–80, plus the Shinkansen Hakone → Kyoto → Osaka → Tokyo. |
Ours Narita Airport → MIMARU Tokyo Ikebukuro: train 58 min ($10–30), bus 2h6min ($39–41), or a private transfer ($75–100). Ubers, JR East, subways, local rail, buses and taxis all run in Tokyo and Osaka. |
| Accommodation | AI Different hotel in each city, no names given: Tokyo & Kyoto ~$250–300/night, a Hakone ryokan ~$420–520/night, Osaka ~$220–260/night. |
Ours MIMARU Tokyo Ikebukuro — 4★, 8.9/10 location, ~$524/night. Hotel Universal Port Vita, Osaka — 4★, 9.1/10, ~$334/night. Both named, bookable and rated. |
| Food | AI Ramen, sushi & more. Family breakfast $20–30, lunch $60–90, dinner $70–100 — no specific places named. |
Ours Real, per-person prices: 7-Eleven meal $11, supermarket food $7.40, a bowl of ramen $11, conveyor-belt sushi $21 — plus restaurants and convenience stores close to both hotels. |
| Fun activity 1 | AI Free/cheap sightseeing: Senso-ji, Meiji Shrine, Hakone, Fushimi Inari, Nara Park. |
Ours Tokyo Disneyland — $80–120pp, rides, parades and themed lands built for families with kids. |
| Fun activity 2 | AI Osaka Castle, Dotonbori, the Bamboo Grove and a Hakone onsen — plus backup plans if a spot was closed or crowded. |
Ours Universal Studios Japan, Osaka — $90–120pp for a full day of rides and shows; Express Passes cost extra for shorter queues. |
Income of $20,000 minus estimated expenses of $16,192.41 leaves a $3,807.59 surplus — enough buffer for an extra onsen visit, Express Passes at Universal, or just peace of mind.
The AI plan's best idea was pairing big city days with slower, quieter ones. These three didn't make the final budget, but they're worth swapping in.
A sit-down ramen shop between sightseeing days — a warm, filling break that costs about the same as a supermarket meal.
~$11 pp
Kaiten-zushi in Osaka is fast, cheap and genuinely fun for kids — pick plates straight off the belt as they pass.
~$21 pp
The Tokyo–Osaka bullet train passes Mount Fuji on a clear day — worth booking a right-side window seat for.
Included in transportYes. Tokyo and Osaka suit a family of four well within the NZ October holidays, and with our corrections the whole week comes in at $16,192.41 against a $20,000 budget — leaving room to spare.