Absolutely! Olsztyn, Elbag, and Gizycko are beautiful Polish cities with rich history and plenty of sightseeing options. Here are some travel tips to make your journey smoother:

Best Time to Visit:
The best time to visit these cities is from May to September when the weather is pleasant and warm. However, if you are a winter sports enthusiast, December to March could also be an exciting time to visit.

Route and Accessibility:
By Air, the nearest international airports to these cities are in Warsaw or Gdansk. From there, you can take a train or a bus which offers routes to all three cities. The road network in Poland is also excellent if you prefer driving.

Altitude and Acclimatization:
As these cities are not located at high altitudes, you won't need to worry about acclimatization.

Accommodation and Booking:
From lavish hotels to budget guesthouses, these cities offer a wide range of accommodations. It's recommended to book your lodgings in advance especially during the peak tourist seasons.

Clothing and Essentials:
Be sure to pack according to the season. Summers can be warm so bring light, breathable clothing, on the other hand in winter, be sure to pack warm clothing as temperatures can get quite low. Comfortable footwear is recommended as these cities have numerous exciting walking routes.

Health and Safety:
In general, Poland is a safe country with low crime rates. However, always keep an eye on your belongings and avoid deserted areas, especially late at night.

Local Etiquette and Respect:
The locals are friendly and hospitable. Polish people are known to appreciate it when you make an effort with their language so learning few basic Polish phrases could be helpful. Always be respectful to their culture and custom.

Enjoy your trip! It's going to be a multi-faceted journey full of history, architecture, and natural beauty.