Hello! It sounds like you're planning an exciting trip across various cities in Indonesia. I'd be happy to help.

Best Time to Visit:
The ideal time to visit Indonesia, including Surabaya, Trowulan, Blitar, Bondowoso, and Banyuwangi is between May and September when the weather is dry and sunny.

Route and Accessibility:
You can start your trip from Surabaya, which is conveniently accessible by plane. From Surabaya, you can plan local trips to Trowulan, Blitar, Bondowoso, and Banyuwangi. Indonesia has a well-connected network of land transport, so reaching these places should be straightforward by car or bus.

Accommodation and Booking:
From budget to luxury, you'll find a variety of accommodations in these cities. It’s always a good idea to overlook online booking sites such as Booking.com, Agoda, Airbnb for the best rates and availability. Advance booking will help you secure desirable places.

Clothing and Essentials:
Pack light cotton clothes to manage the heat and humidity. Don't forget your sunscreen, a wide-brimmed hat, good walking shoes and an umbrella or raincoat for sudden showers. Also, pack insect repellent to protect against mosquitoes.

Health and Safety:
Ensure you have comprehensive travel insurance to cover any medical expenses. Stay hydrated to avoid heat exhaustion and always use bottled water for drinking. Be cautious while crossing roads as traffic can be erratic.

Local Etiquette and Respect:
Indonesians are generally polite and informal. Remember to dress modestly, especially when visiting religious sites. It's also customary to use your right hand for most activities like eating, shaking hands, giving or receiving something.