Explain exactly what your hobby is by providing a basic definition for your readers.
Tell in detail what exactly you do for your hobby by detailing steps or processes of your hobby.
Talk about where you do your hobby. Location can give both insight and interest to your writing.
Detail the process of how you got involved and how you participate in your hobby. Talk about what gear you need.
Write a brief account of some times you have been involved in your hobby. Tell a story of what you did, what happened, and why you enjoyed it.
Explain why you like your hobby. Talk about what it is about the specific hobby that interests you.