I do not have any official hobbies, but if I did, these would be some of them.

Bicycles  I ride bicycles alot and have several bikes.  I have had a lot of fun riding with my family and friends and meeting new friends.  It is fun to ride and explore.

Remodeling  I have built a house and remodeled others.  Most recently, I was part of a group that replaced windows in the Harney Peak Lookout in the Black Hills of South Dakota. 

Hiking  This is so much fun that there is a whole section devoted to this topic.  I will not duplicate it here.