I'll go back
I was really excited to visit La Palma. The island is beautiful, and I really wanted to see Caldera de Taburiente. As it was my first trip there and I was busy seeing everything I could, I didn't have time to hike up the mountain, but from the spectacular views I saw from the vantage points, there's no question I'll go back and dedicate more time to hike up calmly.
It's important to stop at the Visitor's Center so that they can inform you about the differnt routes and the conditions they're in. The most popular routes to do in a day are the Cumbrecity vantage point route, from where the majority of the pictures of the place are taken. There's also the Brecitos al Barranco de las Angustias route, which is almost all downhill, the Nacientes de Marcos y Cordera and Los Tiles route, along the exterior part of the crater, a 6-hour downhill hike.