Sure, a trip to the bustling cities of Warsaw, Lódz and Krakow is definitely exciting! Here are some travel tips that might help you along your journey:

Best Time to Visit:
The ideal time to visit these cities in Poland is either during the Spring (between April and June) or Autumn (from September to October). These seasons offer rather pleasant weather. Avoid the winter months if you're not used to extremely cold temperatures.

Route and Accessibility:
Start with Warsaw, which is well served by international flights. For traveling between the cities, train travel is a comfortable option. Poland has a well-organized and efficient rail system.

Altitude and Acclimatization:
The cities of Warsaw, Lódz and Kraków are on pretty low altitudes, so there are no significant acclimatization issues to worry about.

Accommodation and Booking:
Both these cities have a wide range of accommodations to fit different budgets. It's advisable to book in advance, especially if you’re planning to visit during peak vacation season or during any main events or festivals.

Clothing and Essentials:
Pack according to the season. If you're visiting in Spring or Autumn, pack comfortable clothing and good quality walking shoes. Poland has many beautiful parks, and cities are best explored on foot. Do not forget to pack an umbrella or a raincoat, as occasional rainfall can occur. If you plan to visit in winter, pack plenty of warm clothing.

Health and Safety:
Poland is considered a safe country to visit. However, it's always advisable to have travel insurance. Keep emergency numbers at hand and be aware of your surroundings.

Local Etiquette and Respect:
Polish people are generally reserved and polite. It's important to show respect for local traditions and customs. Poles are also very religious, so remember to dress modestly when visiting religious sites.

Overall, irrespective of the city you are in, always have a copy of your important documents, keep your belongings safe, and stay alert about where and what's happening around you!