Record the number of explosions per hour and know what the volcano is doing. Do not expect other people to come into the danger zone and rescue you. Travel with a person experienced in the local conditions. There are many sources of danger on a volcano. Extreme heat, cold, windstorms, heavy rain, altitude sickness, blizzards, becoming lost, volcanic activity, dangerous plants, animals, and insects.
Volcanoes generate their own weather which can be severe and different from that only a few km away.
Beware that some areas may be high risk areas for robbery etc. Look for evidence of recent ejecta. If you can see recent bombs on the ground then you can be hit. Limit your time in that area. Recent bombs are black and stand out from the brown colour of older lava.