Off page seo main technique is high pr blog comment which are do follow site. unique contain, different keyword/anchor test
Submit related articles you can get natural visitors. I do not personally believe in other seo techniques.
For gaining better SERP we have to make variation in our link building techniques. We can not get good results by only one or two methods.
Today, Guest Posting, Forum posting, Article submissions, Blog posting and niche commenting is beneficial for effective SEO. And also you can create Wikipedia links for your travel site..
In current scenario i am doing Article Submission, Blog Posting, Social Bookmarking, Forum Posting and nothing else. While monitoring the result not so much improvement in keywords ranking but in terms of referral traffic increased. So, it is very difficult to say this activity is good and continue. After all social media optimization is in process.
Forum posting, article submission, social bookmarking and guest posting are the best website promotion techniques in SEO.