Is Zhengzhou worth stopping for, or just a hub?
Stopping for. Shaolin alone justifies a day; the museum and the theater city justify two. It is the most underestimated city on the high-speed network precisely because everyone only ever sees the station.
How do I get to Shaolin Temple?
Coach from the central station to Dengfeng every 40 minutes (about ¥28, 90 minutes), then a short local hop — or a Didi for two to four people. Go before 08:00 for the morning kung fu show and thinner crowds; the ¥80 ticket covers temple, Pagoda Forest and shows.
Is 只有河南 worth ¥290?
If immersive theater interests you at all, yes — it is unlike anything else in China, and the day ticket includes one of the three headline plays (pick 李家村 first-timer). Give it a full day; half-days leave frustrated.
Two days or three?
Two full days: city core plus Shaolin. Add a third for 只有河南 — it deserves its own day — or for the Yellow River park and Kangbaiwan manor, which combine into one.
What is the one dish to eat?
Huimian at 合记 — the bowl the city is built on. But the more local answer is hulatang at 方中山 before 08:30: stand in the queue, drink the pepper soup, and you have done Zhengzhou properly.
Can I use the 240-hour visa-free transit here?
Yes — Zhengzhou Xinzheng is a designated port, and the permitted area is the whole of Henan province, which conveniently contains Luoyang's grottoes and Kaifeng as well.
Is the museum really that good?
It is the honest rival of the national-level museums: nine designated national treasures including the 8,000-year-old bone flute, and free. Reserve two to three days ahead on weekends, go Tuesday to Sunday, and give it three hours.