There is no fix format to implement off page activities. It depends on which industry you are working for and in that particular industry where the people tends to go.
For e.g: SEO Industry - off page activities
Guest posting on high quality seo blogs
Actively sharing and posting on social media channels like FB, Twitter and linkedin
Forums discussions
Blog Commenting
Local Listings
Content Marketing activities: Article Submission, Infographic Submission, Classified Submissions, Web 2.0.
Make sure you post on the sites where the people of that industry are most active.
And most important thing is that you should always post high quality unique content on high quality and authoritative sites.