Hello! That sounds like an exciting trip to Slovakia. Here are some travel tips.

Best Time to Visit:
The best time to visit these locations in Slovakia is between May and September. This period usually has pleasant weather suitable for outdoor exploration.

Route and Accessibility:
Bratislava, being the capital city of Slovakia is well connected via air, rail, and road. From Bratislava, you can reach Dunajská Streda, Senec, and Trnava either by train or by bus.

Accommodation and Booking:
Bratislava has a wide range of accommodations, from budget to luxury. For Dunajská Streda, Senec, and Trnava, small hotels and B&Bs are the norm. Booking at least a month in advance would be advisable to get the best options.

Clothing and Essentials:
You should pack both light and warm clothing, as temperatures can vary. Don't forget your comfortable shoes for exploring the cities. Also, carry a waterproof jacket and umbrella due to unpredictable rain showers.

Health and Safety:
Slovakia is generally a safe country. Always have a copy of your passport and other important documents. Keep emergency numbers handy. It is always wise to stay cautious about personal belongings and maintain good hygiene.

Local Etiquette and Respect:
Slovaks are traditionally polite and reserved. Tips are expected in restaurants and bars. When visiting religious sites, dress respectfully.