1. Inadvertently stepping in molten ash.
2. Contracting rabies from a local dog. Or bat. Or pig (is that even possible?).
3. Mosquitoes, which carry dengue fever.
4. DEET, a known carcinogen, which one must use to fend off the mosquitoes. See 3, supra.
5. Hepatitis A.
8. Liver damage, from taking anti-malarial agents. See 7, supra.
9. Unexpected emissions of hot gas and volcanic eruptions.
10. Falling off a zipline.
11. Burns from sitting in a too-hot thermal spring.