The highest point of Spain and of the islands in Atlantic. Really worth getting there, cause the 360 view is just breathtaking, if it's not cloudy. The smell of sulphur and decreased concentration of oxygen is gonna lead You all the way up, from the cable car top stop at ~3400 till the peak. Cable car is quite expensive, but it's worth the pay for the amusement You are to get (regular tourist's point of view).
P.S. don't forget the permission from local authorities
P.P.S. if You are planing to climbing up and take the cable car downwards, make sure You got cash, there is no credit card service up top, but there is free wi-fi, so You can video skype to your mamma xee