Hello! That sounds like an exciting trip to the cities of Olsztyn, Elblag, Gizycko in Poland. Here are some travel tips:

Best Time to Visit:
The best time to visit these cities in Poland is from May to September when the weather is warm and pleasant for outdoor activities.

Route and Accessibility:
All three cities are accessible by rail and road. Olsztyn has a domestic airport, Olsztyn-Mazury Airport, which connects with several cities in Europe. From Olsztyn, you can take a train or bus to Elblag, and from there to Gizycko.

Accommodation and Booking:
All three cities have several options for accommodation, from luxury hotels to budget lodgings. It's recommended to book your accommodations in advance, especially during the summer season.

Clothing and Essentials:
As Poland has a temperate climate, packing should cater to the weather during your visit. In summer months, light clothing, sunscreen, hats, and comfortable shoes are recommended. Always carry a rain jacket or umbrella for unexpected showers.

Health and Safety:
Poland is generally safe for tourists, but it's always wise to have travel insurance. Ensure you have all necessary vaccines before your trip. Remember to maintain personal hygiene and consume safe and clean meals to avoid any health issues.

Local Etiquette and Respect:
Poles are generally formal and polite. Learn a few basic phrases in Polish to greet and thank locals. Respect the local traditions and customs, and refrain from making noise in public places.