Hello! It's great to hear that you're planning a trip to Isfahan, Yazd, and Shiraz. These are some beautiful cities in Iran, rich in history and culture.

Best Time to Visit:
The best time to visit these cities is during the spring (March-May) and then fall (September-November). These seasons offer comfortable weather with daytime temperatures usually between 16-27°C (60-80°F).

Route and Accessibility:
As an international visitor, you're likely to enter Iran through Tehran's Imam Khomeini Airport. From there, it's a brief domestic flight to Isfahan, Yazd, or Shiraz. You can also travel between these cities via road or rail, which offers a chance to see more of Iran's varied landscapes. Trains and inter-city buses in Iran are clean, comfortable, and punctual.

Accommodation and Booking:
Each of these cities offers a range of accommodations to suit different budgets, from luxurious hotels to budget guesthouses. Aim to book your accommodation well in advance, especially if you're traveling during peak seasons. Many hotels and guesthouses in Iran can now be booked online.

Clothing and Essentials:
Iran is a conservative country and it's important to dress modestly. Women should carry a headscarf at all times. In addition to clothing, carry a good map or GPS, a phrasebook or translation app, and a power adapter for your devices (Iran uses Type C/F, 220V).

Health and Safety:
Iran is generally safe, but standard travel precautions apply. Ensure you have comprehensive travel insurance, and keep your belongings secure. In terms of health, avoid drinking tap water. It's advised to be up-to-date with routine vaccinations like measles and flu. Also, consider getting vaccinations for Hepatitis A and Typhoid.

Local Etiquette and Respect:
Iranians are warm and hospitable people. As a sign of respect, try to learn a few basic phrases in Farsi. It's common to politely refuse an offer at least once before accepting.