A good day out is to go up Mount Teide, the volcano, a famous landmark on Tenerife.
We went by hire car, but there are organized trips. The trip is not for the fainthearted, as sometimes there are only little stone bollards at the edge of the road between the car and the steep drop down, but the views are spectacular.
The road winds through small villages perched on the mountain edge, and eventually we passed through clouds to emerge at the country park near the top. Here there is a picnic area, cafe, and walks through the countryside. It was wonderful to look down on to the top of the clouds.
Further up is like a different world - rather like what I imagine being on the moon to be - and this is where Planet of the Apes was filmed. There are various stop-off points for walks for more views of funny-shaped rocks. There is also a restaurant with tables outside on the patio where (if you are lucky) you may see very big lizards (someone told us they were iguanas, but we only saw little ones).
To reach the very top of Teide, you have to go on the cable car, which we haven't done yet, but this is the very tip of the volcano. Everywhere there is evidence of the last volcanic eruption where black lava has flown down the hillside.