Sure, here are some travel tips for your upcoming trip to these beautiful coastal cities in Brazil:

Best Time to Visit:
The best time of year to visit Fortaleza, Natal, Recife and João Pessoa is during the dry season, which runs from August to January. However, these cities have pleasant temperatures throughout the year.

Route and Accessibility:
The most convenient way to travel to these cities could be by flying into Fortaleza's International Airport, then taking domestic flights or buses to the other cities. The order of travel can be Fortaleza -> Natal -> João Pessoa -> Recife assuming you are traveling in north to south direction.

Altitude and Acclimatization:
These cities are at sea level, so there should not be any issues related to altitude sickness. However, take time to acclimate to the high temperatures if you are not used to tropical climates.

Accommodation and Booking:
There are a variety of accommodations to choose from including luxury resorts, boutique hotels, and budget-friendly hostels. It is best to book accommodation well in advance, especially during the high tourist season.

Clothing and Essentials:
Pack lightweight, breathable clothing for the tropical climate. Always carry sunscreen, a hat, and sunglasses to protect yourself from the sun. Don’t forget your swimming attire and a beach towel for those beach days.

Health and Safety:
Brazil does have a risk of Zika virus, so take precautions against mosquito bites. Also, stay cautious of your belongings, as like in any tourist place, there may be petty crime like pickpocketing.

Local Etiquette and Respect:
Brazilians are generally very friendly. A basic understanding of Portuguese would be beneficial as English is not widely spoken outside tourist areas. It's considered rude to arrive on time for social occasions, being 15-30 minutes late is expected and normal.

I hope you have a fantastic trip!