score:4
I suspect hiking to the top of Mount Pinatubo might fit in this category.
A fair-sized lake now graces the summit where a lot of rock was previously. At least 846 people died in the 1991 eruption so it certainly qualifies as a disaster.
Wikipedia says (original source link is currently dead, emphasis added):
The caldera formed and Lake Pinatubo has since become a tourist attraction with the preferred route through Barangay Santa Juliana in Capas, Tarlac.