Uhmmm... I think you should try "Salak Bali" or zalacca zalacca then mangoosteen aka manggis and its brother white mangoosten aka garcinia mangostana, kemang or binjai (these can be find in Bali and Lombok) Then when you reach Java Island, you'll find many other special fruits in Malang, East Java and Semarang, Salatiga, Central Java, Kepel in Yogyakarta. But if the fruit's season is over.. you'll find at least the tree around Prambanan Temple, Cannon ball tree around Borobudur temple. Would find more information about the orchard in Java Island for you @puravidaville