Hello! It's an exciting plan to visit the splendid cities of Indonesia - Jakarta, Bandung, Yogyakarta, and Surabaya. Here are some travel tips for your journey.

Best Time to Visit:
The best time to visit Indonesia is between May and September when the days are dry and sunny. However, it can be a bit crowded as this is the peak season. For fewer crowds consider travelling in shoulder months such as late April or October.

Route and Accessibility:
For international travelers, the most common way to reach Jakarta, which is the first stop on your trip, is via the Soekarno–Hatta International Airport. From Jakarta, domestic flights or train rides will take you to Bandung, Yogyakarta, and Surabaya. Renting a car or hiring a driver is a recommendable option too.

Accommodation and Booking:
Accommodations in these cities range from luxury hotels to budget guesthouses. Booking.com, Agoda, and other similar sites are useful for finding and booking accommodations. It's advisable to book in advance, especially during the peak season or around local holidays.

Clothing and Essentials:
Light, breathable clothing is ideal for the tropical climate. A light rain jacket is useful for sudden downpours. Sunscreen, mosquito repellent, travel adapters (Indonesia uses European-style two-pin round plugs), and basic medications are other essentials to pack.

Health and Safety:
Basic health precautions such as using bottled water for drinking and maintaining personal hygiene should suffice. Street food, while delicious, can sometimes lead to a sensitive stomach, so consume with care. As for safety, while Indonesia is generally safe, do be cautious of pickpockets in crowded areas.

Local Etiquette and Respect:
Indonesians are generally conservative. So, be respectful, dress modestly especially when visiting religious places, and avoid public displays of affection. It is also customary to use your right hand for eating, giving, or receiving things.