In reply to Trangia:
Usually just a stroll upwards and back on a pretty good path with some loose rocks underfoot at maximum, but not soo mucch exposure, as far as I can remember (have been there one December some years agoo), although there have been a few rare years with significant snow requiring equipment. If going directly from the beaches, probably better to stay for a few days at altitude (the hike from Guajara - ~2700m - back to the Lajas camp site at 2100m is pretty nice and doable with bus approach or hitch-hiking from the camp). Plenty of people going by the cable car directly from the seaside and getting altitude sickness though, and the summit tends to be quite windy. The last 200m from the cable car is mostly paved (of course unless there is the rare snow). If you manage to make a reservation at the Altavista hut, AFAIK you don't need a summit permit if you go there for the sunrise and return before 9 am. As others noted, it's pretty nice to return via the western side along Pico Viejo, the landscape is great, although you might need to hitch-hike back to the car park. Unless the conditions are really bad, the only consideration was mainly the altitude and wind, especially with taking the cable car, as lot of "tourists" tended to be ill-prepared for that. Everything is quite dry, though, and some of the camp sites in the park might not have water.
Post edited at 00:24