Absolutely! Istanbul, Antalya, Fethiye, and Bodrum are amazing destinations in Turkey. Here are some useful travel tips for these places:

Best Time to Visit:
The best time to visit Istanbul and Antalya is between April and October when the weather is warm and sunny. Fethiye and Bodrum have a similar climate and can be visited throughout the year, the peak season being between May and October.

Route and Accessibility:
Istanbul, Antalya, and Bodrum have international airports making them accessible from various parts of the globe. You can travel to Fethiye via road from Antalya or Bodrum.

Altitude and Acclimatization:
These cities are at sea level so altitude sickness is not a concern. However, ensure to stay hydrated, particularly in the hot summer months.

Accommodation and Booking:
All these cities offer a wide range of accommodations from budget to luxury. Some popular areas to stay in Istanbul include Sultanahmet and Beyoglu; in Antalya: Kaleici, Lara; in Fethiye: Calis Beach area, and in Bodrum: Gumbet, Yalikavak. It is recommended to book your accommodations in advance particularly in the peak season.

Clothing and Essentials:
Light breathable clothes are ideal for the summer months, while warmer clothing may be required in the cooler months especially in Istanbul. Don't forget your swimwear, sunscreen and comfortable footwear.

Health and Safety:
These cities are generally safe but like all major tourist spots, beware of pickpockets, especially in crowded areas. It is also sensible to take out travel insurance that covers medical expenses and trip cancellation.

Local Etiquette and Respect:
Turkish people are generally very hospitable and respectful. Dress modestly, particularly while visiting mosques. Tipping is customary in Turkey. A rule of thumb is to tip around 10% at restaurants and round up to the nearest lira for taxi fares.