Hello! That sounds like an exciting trip. Here are some travel tips for your visit to Beijing, Shanghai, and Hong Kong.

Best Time to Visit:
The best time to visit Beijing and Shanghai is during autumn (September to November) when the weather is mild and pleasant. As for Hong Kong, October to December is considered the best time due to comfortable temperatures and lower rainfall.

Route and Accessibility:
Major airlines have direct flights from numerous global cities to these destinations. Beijing is served by Beijing Capital International Airport, Shanghai by Shanghai Pudong International Airport, and Hong Kong by Hong Kong International Airport. From the airports, you can easily reach the city centers with local transportation, like metro, buses, and taxis.

Accommodation and Booking:
All three cities have a range of accommodations, from luxury to budget hotels. It's recommended to book your hotel beforehand, especially during peak travel seasons. Websites such as Booking.com, Agoda, or Airbnb offer many options.

Clothing and Essentials:
Pack light clothing for the day and some warm clothes for cooler evenings. Always carry an umbrella or raincoat due to unpredictable weather. Don't forget to pack a good pair of walking shoes, sunscreen, and a universal power adapter.

Health and Safety:
Urban areas in these cities are generally safe, but take standard precautions against petty crime. Since air pollution could be an issue, especially in Beijing, you may want to pack a face mask. Always ensure you have travel insurance before your trip.

Local Etiquette and Respect:
Chinese people value respect and courtesy. When visiting religious or historic sites, dress modestly and follow local customs. Be aware that tipping can be seen as offensive in mainland China, but it's common in Hong Kong.