Absolutely, here are some travel tips for your journey through Jakarta, Bandung, Yogyakarta, and Surabaya in Indonesia:

Best Time to Visit:
The best time to visit these cities in Indonesia is during the dry season from May to September. The weather is pleasant and suitable for outdoor activities. Avoid the rainy season (October to April) as it can cause disruptions in your plans.

Route and Accessibility:
Your journey can start from the capital city Jakarta, then to Bandung by train or car, followed by Yogyakarta, and end in Surabaya. Trains and buses connect these cities or you can also hire private transport. Flights are also available if you want to cut down travel time.

Altitude and Acclimatization:
Generally, these cities are not at high altitudes, so there isn't a need to worry about altitude sickness or acclimatization. However, be prepared for tropical weather, which can be hot and humid.

Accommodation and Booking:
There is a wide range of accommodations available in these cities, from budget hostels to luxury hotels. It is best to book your accommodation in advance, especially during peak tourist season.

Clothing and Essentials:
Pack lightweight and breathable clothes suitable for humid weather. A hat, sunglasses, and sunscreen are essential to protect from the sun. An umbrella or raincoat can come in handy during sudden downpours.

Health and Safety:
Stay hydrated and protect yourself from mosquitos carrying diseases like dengue fever. It's also advisable to have travel insurance covering theft, loss, and medical emergencies.

Local Etiquette and Respect:
Indonesians are generally polite and respectful. Dress modestly (especially when visiting religious places), respect local customs, and avoid touching people's heads as it's considered rude. It's also polite to ask for permission before taking people's photographs.