If you drive up one of the volcanoes, beware of sudden altitude sickness. My traveling companion started coughing at the top, and luckily I realized that it wasn’t asthma, and got them back in the car and started driving down. A few minutes after we started driving down, they developed the worst headache of their lives. By the time we got down to sea level, the coughing had mostly receded, but the headache lasted the rest of the day.
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