You must describe your journey to your world. Tell about your ship, or describe your travel over land if that is the situation. Tell about how things look, feel, smell and maybe even taste. When you reach your world, describe it in the same way that you told about your journey there. What plants do you find.
Conflicts are a part of every explorer's experience.
Tell how you solve the problems which are a part of every journey. Settle in a specific spot. Describe the setting in which you establish a fort or village or settlement of some sort. The more detail you give, the more realistic your journal will be. Tell about your journey back to your home country.