Yep, Hopefulist is right, I mixed up Pacaya with Volcano San Pedro. That's what happens when you do too much hiking in the noon sun! :-)
That said, I still recommend the AM hike.
One suggestion for Pacaya, though - I brought cheap canvas work gloves with me, the kind you would wear when doing light yard work or handling lumber. The lava rocks can be a bit rough (even sharp) and sometimes the footing can be a bit loose. If you stumble and put your hands out to brace your fall, it can be a bit nasty. Its not critical to have them, but I was glad that I was wearing mine as I scrambled over the terrain. This might be a good idea for the children.