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Three attractions near each other. The Poblado de Guinea is a museum village where you can see how people lived up until the 1960s or so. This attraction is free and without any guide (a single page with few explanations in English and a map can be requested at the information centre). The two others attractions cost €9.5, last approximately 1 hour and have a Spanish-speaking guide. The tubo volcánico is a volcanic tube (a single page with few English explanations will be given). The Lagartario is a home to giant lizards, looking like small dragons, that earlier were on the verge of extinction (posters are translated in English).
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Wild natural swimming pools, made accessible by stairs and wooden walkways
Walled natural swimming pool, most popular bathing resort in summer, well suited for lap swimming (fitness)
Swimming pool integrated into nature, particularly suitable for children
Beautiful, blue (azul) seaside resort
If you travel uphill the old road from Frontera, you will arrive to a flat area (llano means flat in Spanish) with a small parking lot and water source. From there, there are two hiking trails. One leads to a rainforest, and the other uphill to a volcanic crater and into a pine forest.
Los Letreros. Here you can find traces of the Bimbaches, the first inhabitants of the island. It's in a region with few trees, accessible by foot only. There's a visitor center accessible by car, where you can learn about the people, the settlement and the rock inscriptions. The sites themselves may be accessed by tour only, which needs to be reserved at least one day ahead.