instruction: Write a summary of the outdoor activities to do in Colorado
response: There are many outdoor activities that you can do in Colorado year around. It is best to determine whether you want to participate in those activities during summer or winter. For summer outdoor activities, there are adventurous activities like hiking, mountain biking, whitewater rafting and fly-fishing. There are also many outdoor activities in the winter like downhill skiing, cross-country skiing, snowboarding, snowshoeing and snowmobiling. Regardless of the time of year, there are many outdoor activities that you can do in Colorado.