Hello! It's exciting that you're planning to visit Istanbul, Cappadocia, and Antalya in Turkey. Here are some tips that you may find helpful:

Best Time to Visit:
The best time to visit these locations in Turkey generally falls from April to May and September to mid-November when the weather is pleasant. However, if you want to enjoy the beaches of Antalya, the warmer months from June to August would be ideal.

Route and Accessibility:
All three cities have airports with regular domestic flights operating from Istanbul. From Istanbul to Cappadocia, there are also overnight buses. From Cappadocia to Antalya, you can choose to drive, take a bus, or a domestic flight. All the cities are well connected by road as well.

Accommodation and Booking:
Each city offers a range of accommodations from luxurious hotels to budget-friendly guesthouses. In Cappadocia, staying in a cave hotel can provide a unique experience. Online platforms like Booking.com, Expedia, or Airbnb can be used to compare prices and book accommodations.

Clothing and Essentials:
Pack lightweight, breathable clothes for the balmy weather. Also, remember to take some warm clothes since temperatures can drop in the evenings. A sturdy pair of walking shoes would be beneficial to navigate the terrain in Cappadocia. Additionally, carry sunblock, sunglasses, and a hat for sun protection.

Health and Safety:
Ensure you have comprehensive travel insurance. Stay hydrated and wear skin protection. Turkey is generally safe, but it's always good to be cautious to prevent pickpocketing or scams. Traffic can also be a bit chaotic, so be careful while crossing roads.

Local Etiquette and Respect:
Turkish people are quite hospitable and friendly. When entering mosques, dress modestly and remove your shoes. Also, it's good to know some basic Turkish phrases like 'Merhaba' (Hello) and 'Teşekkür ederim' (Thank you).