Use given activities like: -Bookmarks -Article submission -Press Release -Blog posting -Forum posting -Directories but limited etc.
Web 2.0, Article Submission, Social Bookmarking and Blog commenting is the best Off page optimization techniques.
You should do Blog Comments, Forum, Blog, Article and Social Bookmarking these all are best Activities.
Blog comments are a fairly easy go to tactic for off page work. If you are willing to do a bit of work, you can try do some guest posting (though this is a hit hit-or-miss depending on the site you guest post on). Social bookmark tools are good to use as well
You can use almost all the activities of off page optimization but do with quality. Remember, you need to have natural link profile!