Some observations,
You are asking two questions, what aspects of the hobby do you enjoy and what are some sub-hobbies of the gaming hobby?
1. A few of these are not hobbies of any kind. They fall under the category of parts of the hobby I like best.
2. Reading is essential to everything in the hobby like researching.
3. A sub-hobby would be like colleting miniatures or photography. Entertaining is not really a hobby in this context. It needs to be something that by itself could be a hobby.
4. Gaming IS the hobby, NOT a sub-hobby.
I would list these as sub-hobbies:
Figure Collecting
Painting Miniatures
Modeling (Under which you can catch many listed items)
Tournaments
Photography
Research/ Scenario Design
Dioramas (modeling?)
The rest and some of the above are a list of what we like about the hobby. It contains aspects of several other hobbies including:
Researching
Modeling/Dioramas
Gaming
Hosting Games/Running Games
Research/ Scenario Design
etc..
Non-game related things I enjoy about the hobby.
Friends
Beer
Entertaining
A lot of these will be in more than one category. Try two different polls as stated above. I am probably over-thinking this. I need to take up a hobby.