Absolutely, it's exciting to visit the colorful cities of Warsaw, Kraków, Gdansk, and Wroclaw in Poland! Here are some travel tips for your journey:
Best Time to Visit:
The best time to visit these cities is in the Spring (April to June) and Fall (September and October). The weather is pleasant for sightseeing during these months.

Route and Accessibility:
All cities are well-connected by Poland's efficient train system. You can start your journey in Warsaw, then head to Kraków, followed by Wrocław and end your trip in Gdansk.

Altitude and Acclimatization:
The cities are situated at low altitudes, so altitude sickness isn't likely to be a concern here.

Accommodation and Booking:
It's recommended to book your accommodations in advance. Each city offers a variety of accommodations from luxury hotels to budget hostel and guesthouses.

Clothing and Essentials:
Dress according to the season as it can get very cold in winters (November to February) and moderately warm in summers (July & August). Always carry a good pair of walking shoes, as these cities are best explored on foot.

Health and Safety:
No specific health concerns. However, it's always good to have travel insurance. Keep your belongings safe as petty theft can occur in crowded tourist areas.

Local Etiquette and Respect:
Poles appreciate courteousness and good manners. Always remember to greet people with a pleasant "dzień dobry" (good day). In the city of Kraków, keep noise to a minimum as the city authorities enforce Quiet Hours from 10 pm to 6 am.

Enjoy your time in these vibrant Polish cities!