It is possible to walk within the Parque Nacional de Timanfaya, but you’ll need to plan in advance as only eight people are permitted at a time. The 3.5km, two-hour Tremesana guided walk (in Spanish and English) leaves from the Mancha Blanca Visitors Centre at 10am on Monday, Wednesday and Friday.
The much more demanding Ruta del Litoral (9km, six hours) takes place once a month (no fixed date). Reservations are made via the website and you need to book several weeks in advance. All walks are free.