A Trip to Navacerrada. How to Spend a Few Days in the Mountains.

My friends and I have thought about going on a trip to the mountains. For that reason we will need sleeping bags, drinking water, food, winter coats in case the weather is cold.
Our place of destination will be the mountains of Madrid, and we would like to climb La Bola del Mundo in order to see Madrid from above.
When we will be there, we will observe and examine the flora and the fauna. We will see all the type of animals and the diversity of flowers. One of my friends knows a lot about environment, therefore we will learn how to name the plants and the characteristics of different animals that we will see. At night we will stay in a tent or a cave, where we will sleep and eat.
We will repeat the same for about three days.
We would like to enjoy this unforgetable excursion.