Hello! Your trip to Yogyakarta, Kotagede, Prambanan, Borobudur sounds truly exciting. Let me give you some valuable travel tips.

Best Time to Visit:
The best time to visit Yogyakarta and surrounding destinations is between May and September when the weather is dry. But keep in mind that this is also the high season, during which you may find a lot of tourists.

Route and Accessibility:
Yogyakarta is easily accessible by air. There are direct flights from major cities in Indonesia and some international cities. You can reach Kotagede, Prambanan, and Borobudur comfortably by taxi or car rental from Yogyakarta.

Accommodation and Booking:
There's a variety of accommodation available in Yogyakarta, ranging from budget guesthouses to five-star hotels. I advise booking in advance if you are traveling during the peak season.

Clothing and Essentials:
Pack lightweight and breathable clothing due to the tropical climate. Don't forget your hat, sunscreen, and sunglasses to protect yourself from the sun. Comfortable shoes are a must as there's a lot of walking to do in the temples of Prambanan and Borobudur.

Health and Safety:
It's always a good idea to have travel insurance. Stay hydrated and eat healthy. Wear appropriate clothing when visiting religious sites. While Yogyakarta is generally considered safe, it's always wise to be cautious and alert.

Local Etiquette and Respect:
Indonesians are generally respectful and polite. Dress modestly when visiting religious sites. Also, it's recommended to ask for permission before taking photos of locals or places of religious significance.