Hello! It's great to hear that you're planning a trip to Hangzhou, Suzhou, and Tongli. These are beautiful destinations in China and I'm sure you'll have an amazing time.

Best Time to Visit:
The best time to visit Hangzhou, Suzhou, and Tongli is in spring (April to June) and autumn (September to November). These seasons offer moderate weather, perfect for exploring the stunning landscapes and historic sites.

Route and Accessibility:
All the cities you are planning to visit are well connected by high-speed trains from major cities like Shanghai and Beijing. You can also travel by domestic flights, with Hangzhou having an international airport. For getting around within the cities, public transportation like metros, city buses, and taxis are readily available.

Accommodation and Booking:
Numerous accommodations ranging from luxury hotels to budget hostels are available in Hangzhou, Suzhou, and Tongli. It's recommended to book your accommodations well in advance, especially during peak seasons. Websites like Booking.com, Agoda, and Airbnb are helpful for comparing prices and securing reservations.

Clothing and Essentials:
Pack lightweight and comfortable clothing for the warmer months and warmer clothing for autumn and winter. Umbrellas and raincoats might come in handy as these areas could have sudden rain showers. Don't forget your comfortable walking shoes, sunscreen, hats, and personal hygiene essentials.

Health and Safety:
Standard health safety practices apply. Drink only bottled or purified water and eat at hygienic places. Ensure your routine immunizations are up-to-date and consider medical insurance for any unforeseen situations. Always take care of your belongings and be aware of your surroundings.

Local Etiquette and Respect:
Chinese culture values respect and proper etiquette. Avoid public displays of affection and follow the local norms. Learn a few basic phrases in Chinese as it could be very useful while interacting with locals. Always ask for permission before photographing people.