Avoid lengthy descriptions of what you've done and how it's relevant. Managers like to see activities listed for several reasons. Activities show that you're a well-rounded person who has interests, who can maintain interests while busy with other things. This is a good place to accent your skills that aren't covered by work experience. Format Your resume should be easy to read.
Categories Establish levels of organization.
See the samples for clarification. The main idea is to make your resume as easy to read as possible. If everything is indented the same number of spaces, information starts to run together. Things get lost. If you list the address for one employer, list it for all.