The trip up to the lakes ( yes there are two) is a little twisty and turny and if allowed to drive up there, do go, but be mindful that a low cloud day will negate any pleasure you derive from the experience as all you will see is mists and no mountain tops. At times of the year they close the road, so you are forced to get a bus but it is not to expensive and if you are a nervous driver it might well be worth it as other drivers, mores especially Spanish ones who do not see any problem with driving in the middle of the road with a sheer drop one side and ditch or rock face on the other. given the state of some of their cars they regard hitting other cars or rocks as the norm!
Combine the day with a trip to the Basilica which has free toilets and is free to get in and from the outside is spectacular in its setting but not so inside. Lots of space to picnic halfway up BUT do not get pressured into buying a bus seat until you are sure the road is closed and I suspect it gets very busy at times.
Also remember that it might be 8 -10 degrees cooler at the top than the bottom if you want to walk and there is a small café, which I did not use so cannot comment.
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