The next day we wanted to go to one of the most active volcanoes in the chain, Cerro Negro. It didn't exist before 1850, when a steaming crack in the ground suddenly began to spout lava, but now stands 600m tall, black and steaming, above the surrounding countryside. We took a bus to the town of Malpaisillo, from where (so my guide book told me) it was a 4km walk to the base of the volcano.
We set out along the road from Malpaisillo. It was incredibly hot and humid, but by now we were used to it, and we enjoyed it. After about half an hour we caught sight of the volcano, its black slopes dramatically contrasting with the lush greenery surrounding it. We quickened our pace, and after a couple of hours we reached a path which looked like it was going in the right direction. We passed a guy on a bike after a short way, and asked him if we were going the right way. He said that we were, but told us it was a 10km walk to the volcano. If he was right, we wouldn't have time to get back before the buses stopped running, but we decided to walk as far as we could.
Initially our friend on the bicycle left us, but after about 10 minutes, he reappeared, and said he would walk with us. It was nice to have some company, but communication was difficult. My attempts at Spanish seemed to go down worse than usual, and the cyclist spoke no English, so we mostly walked in silence. But I managed to establish that it was always this hot here, that there were often earthquakes, the volcano had erupted two years earlier, and that there were not many snakes around, but they were big.
We walked for about an hour and a half before deciding to give up. For most of the way we couldn't even see the volcano. We saw no snakes, thankfully, though we did see one huge lizard resting in the sun by the roadside. At about 4pm we reached the main road, and waited for a bus back to León.