The climb to Duff's peak takes about 90 minutes. The stones found on the hill were used by the ethnic Mangarevans to predict weather and to look for boats headed for the island. The mountain is covered with tall aeho grass. Black pearls are cultured on numerous platforms on both sides of the Mangareva lagoon. The lagoon is full of corals and black-lipped oysters are harvested by the people. The inhabitants are also involved in agriculture and fishing to the minimum level. The church is involved in technical school (CED, "Center for Educational Development) to train people in skill trades such as carpentry, mechanics, electricity, and mother-of-pearl shell engraving. Father Honoré Laval built 116 stone buildings and arches, and roads were laid. Buildings included a fortified palace with follies as well as St. Michael's Cathedral which has also been characterized as a folly. The structures were built with shaped coral stone blocks. Several of the structures dating to Laval's time still remain, such as the watch towers on the coast and a turret, the remains of the palace built for Maputeoa, the last king of the island. King Maputeoa's crypt is located in the St. Pierre's Chapel behind the neo-Gothic St. Michael's Cathedral. The "Couvent Rouru" (Rouru Convent), near the southern end of the cemetery, is now in ruins, but housed 60 nuns at one time. There is a carving school near the cathedral at Camika CED which features mother of pearl carvings. Here training is provided in the art of shell engraving. Pendants and barrettes created here can be purchased at the centre’s sales outlet. Riktea has a large nuclear fall-out shelter which was built at the time of the French atmospheric testing at Moruroa. The town also has post office, a few shops, a military establishment, a medical room, and schools. Accommodation of note includes Chez Pierre et Mariette near the wharf, with three rooms, and Pension Bianca et Benoit, in the southern part of the town. The town is accessed by air and by ship. The airport is located on Mou Totegegie, NorthEast. From the airport, boats provide the only access to Rikitea. Flights operate from Pape'ete and take four and half hours. Travel by ship originates only from Pape'ete, a journey of 21 days, with stops at four other islands before arriving at the Rikitea.