Hello! It's great to hear you're planning to tour cities in Germany. I'm here to provide you with some travel tips for your trip to Hanau, Kassel, and Hamburg.

Best Time to Visit:
The best time to visit these cities in Germany is from May to September, when the weather is pleasantly warm with temperatures ranging from 20°C to 30°C. It's perfect for outdoor activities and sightseeing.

Route and Accessibility:
Germany has excellent transport infrastructure. You can start your journey in Hanau, which is just about 25 km away from Frankfurt Airport. From Hanau, Kassel can be accessed by road or rail in approximately 2.5 hours. Hamburg is roughly 4 hours away by train from Kassel. Check for tickets online in advance for attractive discounts.

Accommodation and Booking:
Germany offers a range of accommodation options from luxury hotels to budget-friendly hostels. Booking.com, Expedia, and Airbnb are popular platforms to book your stay. It's best to book at least a month in advance during peak tourist season.

Clothing and Essentials:
Pack versatile clothing that can be layered, as the weather can change swiftly. Don't forget a good pair of walking shoes as the cities offers plenty of sightseeing on foot. Essentials also include an umbrella or rain jacket, sunscreen, a hat, and a travel adapter for European sockets.

Health and Safety:
Germany is generally safe. But, as in any tourist destination, please be aware of your surroundings and protect your personal belongings. Travel insurance is always recommended. Most Germans have a decent understanding of English, but it wouldn't hurt to learn a few basic phrases in German.

Local Etiquette and Respect:
Germans appreciate punctuality, so try to be on time for any appointments. When greeting, a firm handshake is common. It's also important to respect quiet hours, typically from 10 pm to 6 am, and all day on Sundays and public holidays.