Hello! It's great to hear that you're planning your trip to Surabaya, Trowulan, Blitar, Bondowoso, and Banyuwangi. These places offer a mix of rich history, vibrant culture, and stunning nature in Indonesia. Here are some travel tips for your journey:

Best Time to Visit:
The best time to visit these cities would be during the dry season, which typically runs from April to October. The weather will be sunny which is perfect for sightseeing and outdoor activities.

Route and Accessibility:
Your journey could start from Surabaya. From there, you can take a bus or rent a car to reach the other destinations. It's recommended to have a local guide or good navigation system for easy travel.

Accommodation and Booking:
You can find a range of accommodations from luxury hotels to budget hostels in all these cities. It's advisable to book your accommodations in advance, especially during the high tourist season. Websites like Booking.com and Agoda can provide a variety of options.

Clothing and Essentials:
Pack light clothing, as the weather will be generally warm. Don't forget your sunblock, sunglasses, and hats for sun protection. Hiking boots may be useful if you plan on exploring nature areas or mountains. Also, pack an umbrella or raincoat for sudden rain showers, even in the dry season.

Health and Safety:
Make sure to stay hydrated, especially if you're venturing out in the sun for prolonged periods. Stick to bottled water for drinking. Have your travel insurance in place. Use insect repellent to protect against mosquitoes.

Local Etiquette and Respect:
Indonesians are respectful people, so be sure to reciprocate. In holy places, dress modestly and follow the directions given. It's considered respectful to use your right hand when giving or receiving something.