The last major eruptions occurred in 1866, however, fumarolic activity remains constant from the summit of the highest peak. There are three well-defined craters located at the top, the most profound of which measures 164 ft (50 m), giving the impression of a lunar landscape similar to that of the Irazu Volcano. In fact, many people call them twin volcanoes due to their similar characteristics and close proximity.

The beautiful volcano covered in dense vegetation looks out over approximately 3,900 acres (1,577 ha) of mostly montane rain forest. A large portion of Turrialba Volcano National Park is made up of primary and secondary forest, which is where it is most common to view the smaller wildlife scurrying around. Hiking along the trails allows you to see the various lava flows that give evidence to the once flowing rivers of hot magma. Once on the apex, various viewpoints along the well preserved trails around the rim of the summit give spectacular 360º views.

The city of Turrialba was once the gateway to the Atlantic coast. Now, it is a great starting point for many activities, especially visiting Turrialba Volcano National Park. The town of Turrialba is located approximately 44 miles (71 km) east of San Jose. From there the national park is just a short drive away. It is recommended to have a 4WD vehicle if you plan on accessing the park on your own. The town offers little in the way of services and admission to the park is approximately $7.