Hello! It sounds like a fascinating trip you are planning to the cities of Medina, Mecca, Ta’if, and Jeddah in Saudi Arabia. Here are some tips for your travel:

Best Time to Visit:
The best time to visit Medina, Mecca, Ta’if, and Jeddah is during the cooler months of November to March. However, it is important to be mindful of the Hajj pilgrimage season which usually falls between July and August and can result in extreme crowding.

Route and Accessibility:
The nearest airports to Medina and Mecca are Prince Mohammad Bin Abdulaziz International Airport and Jeddah's King Abdulaziz International Airport respectively. Once in the city, you can use taxis or rent a car. But during the Hajj season, only those with a Hajj permit are permitted to enter Mecca.

Accommodation and Booking:
Accommodation options in these cities range from budget hotels to luxury five-star establishments. It is advisable to make bookings well in advance, especially during the Hajj season.

Clothing and Essentials:
Saudi Arabia is a conservative country. Men should wear long pants and shirts. Women are required to wear an abaya (a long black cloak) and a head scarf. Sunscreen and a hat are essential to protect yourself from the scorching sun.

Health and Safety:
The heat can be severe so stay hydrated and avoid being out in the sun for extended periods. It is also recommended to get a vaccination for meningococcal meningitis before traveling for the Hajj or Umrah.

Local Etiquette and Respect:
The local customs of Saudi Arabia are based on its Islamic religious traditions and Bedouin culture. During the holy month of Ramadan, eating, drinking, or smoking in public during daylight hours is frowned upon. Respecting the prayer times is important.