Recommandations for hiking and animal photography in Indonesia

Hello everyone,

I'm going to Indonesia for a month in June.

As a wildlife photographer and trekker, I'm looking for recommendations and advice on my itinerary.

I'm planning to spend about 10 days on the island of Java, with Bromo, Kawah Ijen, Dieng Plateau, and Baluran National Park on the agenda.

Then, a week in Sumatra: Gunung Leuser National Park, and the Sibayak and Sinabung volcanoes.

Finally, about 10 days in North Sulawesi: Tangkoko and Bunaken.

-Do you think my itinerary is feasible within the given timeframe? I plan to fly from Jakarta to Sumatra and Sulawesi.

-What other places would you recommend?

-For Gunung Leuser National Park, I'm considering a multi-day trek in the jungle. Do you know of a guide or agency that offers orangutan tours?

Thank you for your replies