Hello! It's great to hear that you are planning a trip to Poland, exploring cities like Poznan, Wroclaw, and Legnica. Here are some detailed tips to assist you on your journey.

Best Time to Visit:
The best time to visit Poland, including cities like Poznan, Wroclaw, and Legnica is from May to September when the weather is warm and the days are long. However, keep in mind that this is also the peak tourist season.

Route and Accessibility:
The most convenient way to travel around these cities is by train or bus. Poznan and Wroclaw have airports with good connections. When travelling between Poznan, Wroclaw, and Legnica, trains are the most convenient and comfortable mode of transport.

Accommodation and Booking:
There's a wide variety of accommodations available in these cities, from hotels to hostels and Airbnb. It's recommended to book your rooms in advance, especially during the peak tourist season. Use credible websites such as Booking.com or Airbnb for reservations.

Clothing and Essentials:
As these cities have a temperate climate, carry clothing suitable for mild to warm weather during summer, and warm clothing for the rest of the year. An umbrella, comfortable walking shoes, sunscreen, and a good city map could come in handy.

Health and Safety:
Poland's healthcare facilities are well developed. Still, it's advisable to have travel insurance that covers health issues. Do keep emergency numbers handy. General safety is good, but as in any city, take care of personal belongings.

Local Etiquette and Respect:
Poles are usually polite and courteous. Handshaking is a common form of greeting. It is appreciated if you show respect to their history and notably World War II. If you're visiting churches, dressing modestly is recommended.