Hello! That sounds like an exciting trip to Brazil's beautiful coastal cities - Fortaleza, Natal, Recife, and João Pessoa. Here are some useful tips for your journey:

Best Time to Visit:
The best time to visit these coastal cities would be between September and January when the weather is warm, yet not too humid. This period also avoids the heavier rainy season that typically begins in late February and goes until July.

Route and Accessibility:
The cities you mentioned are well connected by air, road, and rail. Domestic flights are quite frequent in Brazil. Having a rented car might be a good option if you want to travel at your own pace and explore off-the-beaten-path locations on the coast. It is suggested to check beforehand if an international driving license is required.

Accommodation and Booking:
There are a broad range of accommodations available in these cities, from luxury hotels to budget hostels. Online booking platforms can offer a good overview and user reviews. Always make sure to book in advance, especially during peak seasons like Christmas and New Year.

Clothing and Essentials:
Lightweight, breathable clothing is recommended given the warm and humid climate. Don't forget to pack swimwear and sun protection essentials like a hat, sunglasses, and high SPF sunscreen. You might also want to bring a rain jacket for unexpected showers.

Health and Safety:
Always stay hydrated and use sunscreen regularly. Be aware of your surroundings and practice caution, especially in crowded tourist areas. Strong currents and sharks can be a concern at some beaches, so always follow local advice. Tap water is not safe to drink, so opt for bottled water instead.

Local Etiquette and Respect:
Brazilians are known for their hospitality. Greeting people with a handshake or a kiss on the cheek is common. Tipping is not mandatory but is usually expected in restaurants. English is not widespread, so learning a few basic phrases in Portuguese can be helpful.