Madrid is usually green, and has lots of green parks. The largest park is called Casa de Campo. It is huge, and it is five times the size of central park in New York. This is a must visit place when you are in Madrid. There are many outdoors activities to do in this park such as kayaking (even professional kayaking, people actually are learning how to kayak there to later on compete), the Madrid Zoo is there and the Madrid Arena. You get so much to do in one place, just be sure to go visit at the right time. We were there exactly when it started snowing so we didn't get to see much as it was an unusual day.