This looks a more strenuous walk than it actually is as you don't actually walk from the foot of the mountain but park the car at the start of the footpath which is about a third of the way up. I would recommend you take a pair of trainers as on the descent it can be a bit slippy with the loose scree. Suitable for all ages and we passed kids and pensioners alike on the walk. It took us an hour and a half in total to walk up, go round it, walk down into the crater and then walk down again but we had lots of stops to admire the views. Take your little tourist map with you as we thought it was a great way to get your bearings of all the different areas and hotels.
You can built a little cairn in memory of someone or to mark your being there with all the loose rocks. Having said that we were saddened to see that someone had made a big heart in memory of a lost child and a girl went into the crater and broke up all the writing and set about changing it to her own name. Such heartlessness.
Take a bottle of water with you and go early in the morning or later in the evening to avoid the heat of the midday sun.
Give it a try and work off all those delicious canarian delicacies you'll be sampling!