MTB – another recommendation for Freemotion. V slick operation with nice well set up bikes. I hired some Specialised FS and carbon road bike from the Plays Ingles site.
It’s not just helmets though, I ended up having to buy shoes and a water bottle having not brought these (I know – forced to spend money in a decent bike shop, the horror…) On thing for biking: winter is high season, and they scale back on things like group rides after march.
On the terrain and riding: it’s far from just barren volcanic, you’ve got proper mountains over 1900m, with pine and other forests, and even bits described as jungle (Google La Selva de Doramas). I did one group ride with Freemotion, which wasn’t brilliant as it was a very mixed ability group, led by a roadie down mainly landover tracks. What was good was starting over 1000m and riding to sea level. Quite a few MTBs about and lots of v interesting looking trails.
Surfing: we stayed in the North near las Palmas which picks up loads of swell and is solid with surf hire and schools (which can be annoying when surfing the town beach, but hey…) Not sure how reliable surf is in the south but probably not an issue for learning.
You need a car to see the place. The density of the mountains and also people (las Palmas is Spain’s eighth largest city) means it can take a while getting from A to B. Autoreisen are great for hire.