Measure your inbound links and their value. There are multiple ways to do this, but the best is to plug your site URL into Link Explorer (which used to be Open Site Explorer). This Moz tool provides plenty of utility for no charge, but a paid subscription gives more depth.
With Link Explorer, you can see all inbound links, see your top-linked pages, sort by linking domains, see the anchor text other sites use to link to you, and compare your metrics with competitors. It’s impressive, and it’s an eye-opener for many who do it for the first time.
Majestic is another great off page technical SEO tool.
you can see many off-page activities on internet and in which you will get example of the particular activity. I think it's not enough to dip a perfect off-page for a website. You have to choose off-page activity-based on your website type. if you have a blog site then you should create backlinks as social bookmarking, document directory.
here are some activities that are listed
- Guest post
- forum submission
- comment section
- social media sharing
- social bookmarking
- image submission
- pdf submission
- classifieds submission
- web 2.0