What is one question you could ask yourself to determine your favorite hobbies or activities?                                                 dont answer already done

What do I spend a lot of time doing? 

typically you spend a lot of time doing something you enjoy, and those things are more often than not your main hobbies. such as playing video games or working out.

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The kind of question you could ask yourself to determine your favorite hobbies or activities is the following.

What are the activities that I like the most and truly enjoy while doing them?

By all means, this question is complete and is going to make you think about the many activities you enjoy doing. This way you could list your favorite activities in order to know the priority for each of them. What is first, then followed by what others.