When we were in Jalan Brawijaya (formerly called Panoramaweg during Dutch time), I stopped for a while to take a picture of the city from the balcony of a building. It was cloudy and we could not see the blue color of Arfak mountains.
There are also coral reef sites in Dore bay of Manokwari where visitors can enjoy snorkeling, and free diving to see parrotfish, moorish idol, anemonefish, sea star, and other marine creatures. Don't forget to bring your own snorkeling gear if you want to see them.
If you plan to visit Manokwari and need me as your guide, please, contact me by email to: firstname.lastname@example.org