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A small museum with live butterflies right next to the famous Drago Milenario tree. Quite expensive for what it's worth, but a good sheltered activity for when it's raining.
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Church of St. Mark
Built in the early 16th century on the site of an earlier 15th-century chapel, the church is the oldest in town and is notable for its Renaissance portal. Also noteworthy are the carved wooden ceiling and the silver-embossed Baroque altar.
Drago Milenario / Drago Tree Park
The millenary tree that symbolizes the city, the tree is not actually a thousand years old but estimated to be more likely 600-800 years. With a height of 18 m and a trunk diameter of about 10 m, it is the largest and oldest known drago tree of its species in the world. In 2000 a botanic garden was developed around the tree to protect it from pollution and vandalism; the garden has a number of specimens of typical Canarian flora. The park entrance is around the corner on Calle del Barranco. Travellers who wish to avoid the admission fee can admire the tree from the nearby village square which overlooks the garden.
Museum of wine making, with opportunities to taste local wines in the museums garden.
A rather quiet black sand beach with showers and rest rooms, frequented by locals and the few tourists that make their way down there. Unfortunately, all the little restaurants down at the beach were damaged by the 2018 winter storm and closed down (as of January 2019), but some options remain a bit higher up at the Avenida Maritima. Be aware that sunbathing is not really possible until the afternoon, as the steep cliffs surrounding the village of San Marcos block the sun in the morning.
Cueva del Viento
The largest lava tube cave in Europe and the fifth-largest in the world. It can be visited only in small guided tours. Long trousers and good boots are required, and prior booking is essential. Tickets must be purchased online in advance, valid only for the specified tour, and you must show ID along with your ticket. Considered one of the top attractions on Tenerife, but somewhat difficult to reach.
Doll museum in an estate with a tropical park built around old but stylishly renovated Canarian houses. There are exhibits with dolls and teddy bears of over 30 international artists. Guided tours also show how dolls are cast in porcelain. Tours in English, Spanish, and German.