Desert Biomes — Semiarid, Coastal, Cold & Hot and Dry

You were on your way to a beautiful tropical island when your airplane crashed. You find yourself in a mysterious place. After several weeks of being stranded, you notice that the days are extremely hot, while the nights are very cold. You have trouble finding a good water source, and it hasn't rained yet. Around you there are few trees, but lots of succulents.

What can you conclude about your surroundings?