Erosion in the area has created the nearby Diosso Gorge, known as the "Grand Canyon of the Congo". It has also been called the Diosso Amphitheater. Within the gorge's rainforest, there are rock ridges and distinctive red rock cliffs, which can reach up to in height. The New York Times described Diosso Gorge as "a stunning gorge of plunging, pink cliffs draped with green Central African jungle." According to reports, Gamissamy Issanga, the director of environment at the Congo's research ministry, once approved the dumping of 1 million tonnes of oil, acids and solvents in the gorge. The gorge is said to be inhabited by the female spirit of Mboma, who takes the form of a snake.
Founded in 1982, the ethnography and history of the Loango Kingdom is displayed in the Mâ-Loango Regional Museum, located in Diosso. The museum is a public institution and, as a regional branch, was founded with the aim of protecting cultural heritage. It collects and exhibits objects that are of historical, archaeological, ethnographic and artistic significance, and is situated in a palace that was inhabited by Ma Moe Loango Poaty III, king of the kingdom of Loango. The museum is long by wide and contains rooms, hallways, bedrooms, and the king's bathroom. All these rooms have either been transformed into exhibition rooms or are in reserve. There are over 300 exhibits and documents, as well as a dozen different collections, illustrating historical events and documents that show the evolution of Congolese society. Objects of great artistic value are displayed alongside simpler objects relating to everyday life that are considered important in the study of ancient Congolese people. Traditional work tools include hoes, axes, knives, wooden bellows, gourds, and adzes. Jewelry and traditional clothing include loincloths, headdresses, and the Tchikumbi costume. Domestic items are characterized by a rush mat, as well as straw and kitchen utensils. Weapons and traps include spears, knives, crossbows, hunting wooden bells, hunting wicker traps, and nets. Traditional objects of worship include stone statuettes, Punu mask, the Kidumu mask, as well as the Kebe Kebe and Mboumba figurines. Traditional musical instruments are the Yombe and Dondo.
Sport
The town's golf club overlooks the coast. https://web.archive.org/web/20160410060229/https://sites.google.com/site/diossogolfclub/
