Certainly! Visiting Jeddah, Mecca, and Medina will give you a unique blend of cultural, historical, and spiritual experiences. Here are some travel tips to ensure a smooth journey:

Best Time to Visit:
The ideal time to visit these cities would be during the cooler months from November to February. However, keep in mind that this is also the peak season for Hajj and Umrah pilgrimages, especially in Mecca and Medina. Avoid visiting during the summer due to the extreme heat.

Route and Accessibility:
Jeddah is the major international gateway to the Kingdom of Saudi Arabia and both Mecca and Medina are well connected to Jeddah by road and rail. Non-Muslims, however, are not allowed to enter Mecca and Medina.

Altitude and Acclimatization:
These cities are not at high altitudes, so you would not need any specific acclimatization.

Accommodation and Booking:
There is a variety of accommodation available from luxury to budget hotels. Be sure to book your accommodations well in advance, especially if you're visiting during the Hajj and Umrah seasons.

Clothing and Essentials:
Kingdom of Saudi Arabia follows strict dress codes. Women must wear an abaya (cloak) and men should wear long trousers and a shirt. It is advised to dress modestly while you are there. Don't forget to carry other essentials like sunscreen, a hat, sunglasses and a reusable water bottle.

Health and Safety:
Make sure vaccine records are up to date as Saudi Arabia has specific vaccination requirements for travellers, especially for Meningococcal Meningitis if you’re going to be part of a large crowd. In case of any health issues, medical facilities in Saudi Arabia are of high quality.

Local Etiquette and Respect:
Respect Islamic traditions and customs, especially in Mecca and Medina, which are holy cities. Always ask for permission before taking pictures of people. Public display of affection is frowned upon and alcohol, pork products are prohibited. Also, non-Muslims are not allowed inside the main mosque in Medina during prayer times.