On one of our days in Granada we went with a few people from the hostel to see the Mesaya Volcano. We did an evening tour so we would be able to see the lava clearly.
The shuttle left at four and we stopped half way at an artisan market and did a bit of souvenir shopping.
We got to the national park around 5:30pm and then had to wait around a bit until it opened at 6 - the key is to be at the front of the queue!
We were driven to the top and got out to look into the crater. It was amazing - I can see why it's known as the 'Mouth of Hell'. It was loud and the thunder and lightning just added to the effect of it.
We weren't allowed to stay up long because of the times but it was probably one of the best experiences of my trip so far.