Hello! That sounds like an exciting trip. Here are some travel tips for your visit to Zhengzhou, Kaifeng, and Yinchuan.

Best Time to Visit:
The best time to visit these cities in China is from March to May (Spring) and from September to early November (Autumn). During these times, the weather is pleasant and there are various cultural festivals to experience.

Route and Accessibility:
You can reach Zhengzhou via the Zhengzhou Xinzheng International Airport. From Zhengzhou, you can take a high-speed train to Kaifeng which is around 1.5 hours away. Yinchuan is farther away situated in northwest China and the best way is to take a flight from Zhengzhou.

Accommodation and Booking:
There are several hotels and guest houses available in all three cities, catering to different budgets. It's recommended to book your accommodation in advance, especially during peak tourism season.

Clothing and Essentials:
It's best to travel light and pack clothes that can be layered. Comfortable walking shoes are a must. Don't forget to pack essentials like a first-aid kit, toiletries, and any necessary prescription medication.

Health and Safety:
Stick to bottled water and take precautionary measures regarding food hygiene. It's better to have travel insurance which covers health issues. Also, be aware of your belongings in crowded places to avoid pickpocketing.

Local Etiquette and Respect:
In China, respecting local customs and traditions is important. Avoid public display of affection and always ask for permission before taking photos of locals.