Like many Indonesian islands, Tidore is a volcano. There is a path up to the caldera summit, Gunung Kiematabu, 1730 m above sea level. The path starts from the village of Gura-bunga, on the way between Rum and Soadara and the path isn't well marked so you probably want to have a guide. You'll walk up through forest for about two hours with great views over the island along the route before reaching the crater rim. The volcano has been inactive for a while, so the caldera is overgrown to the extent that it blocks the sight at some places. The path continues to the concrete marker that marks the highest point on the rim (ie. the summit). Unless it's cloudy, there are splendid views to the neighbouring islands.
© OpenStreetMap contributors
Smaller fort towering above the royal cemetery.
A recreation of the original sultan's palace, at the same place.
A 17th-century Spanish fort.
The tombs of the Tidorese royal family are just north of the palace.
On the premises of the sultan's palace. May not be open for visits.
Heavily restored.