I quite enjoyed the black, volcanic sand of Puerto De La Cruz, but it was very boring as far as sight seeing went. We did go up the mountain, but my wife got travel sick on the bus so we didn't make it very far and ended up spending the time in a little town there. It was nice.
Or it's just that somebody has to unclutter his own mind. Then body.
I think this is the issue.
We never entered Puerto De La Cruz but a town above it called La Orotava caused me some proverbial headaches all three times I had to drive through it.
I can't remember the name of the town we visited, but it was pretty and there was some market place festival going on too.