Hello! That sounds like an exciting trip. Here are some tips to help you plan your visit to Brno, Litomyšl, Nelahozeves:

Best Time to Visit:
The best time to visit these cities in the Czech Republic is from May to September. This period generally has the warmest weather and offers a great opportunity to explore the outdoor attractions.

Route and Accessibility:
You can reach Brno first, which is the second-largest city in the country. It is well connected via international flights. From there, you can reach Litomyšl and Nelahozeves by train or bus - both are very accessible.

Accommodation and Booking:
There are a variety of accommodations to choose from in all three cities, ranging from luxury hotels to budget-friendly hostels. Be sure to book your accommodations in advance, particularly during the peak tourist season.

Clothing and Essentials:
Czech summers can be warm, so bring lightweight clothing for the day, but also include some sweaters as nights can be chilly. Always pack a rain jacket as showers can be common. Don't forget a comfortable pair of walking shoes as you'll likely be exploring the city by foot.

Health and Safety:
The Czech Republic has a high standard of public health and safety. Make sure your usual travel vaccinations are up to date. If required, European Health Insurance Card (EHIC) holders will find medical care easily accessible.

Local Etiquette and Respect:
Czech people appreciate good manners. Always say hello (Dobrý den) and goodbye (Na shledanou) when entering shops or restaurants. Respect the local customs and public ordinances, particularly in historic areas.