While it's possible to hike up Mount Pahia, Mount Otemanu is best enjoyed from below. It's impossible to climb to the summit because of the brittle volcanic rock which is too fragile to hold a person's weight. According to the locals, nobody has EVER successfully scaled the top. You can, however, take a hike up to the base. The path is confusing and the jungle is thick so it's recommended to take a guide or a 4x4 tour. Here you will find leftover US cannons from World War II and scattered altars from the ancient past.