Sunlight is intense, especially with snow cover. Sunglasses and sunscreen are preventive measures against snow blindness and sunburn. The only cure is to descend. Pace yourself, drink plenty of water. Pack extra clothing and your sleeping bag in plastic for waterproofness.
Volcanic eruptions are possible at any time.
Stay upslope from active lava flows and remain on high ground. Stay upwind of volcanic gasses. Earth cracks, thin crusts, and lava tubes are numerous. Before you go, leave a trip plan with another person. If lost stay where you are.