Best Promotion Technique

Hi all,
Which is best promotion technique (specially off page) to achieve top 10 ranking as well as high traffic in Google.com (specially US market) after panda, penguin and zebra.

we are noticed rank drop in our major keyword "vacation rentals" in Dec 2012 we are in top 10 but now we are in top 30. we are trying our level best and doing all white hat SEO work but still not getting very good result.

Participates in social networks like twitter, Facebook, Google+ and Tumblr
and also PR distribution and submission. Social bookmarking directory submission and classified all these thing we are trying.

My question is Which off page method is good for travel site to achieve top 10 rank.

Need your valuable suggestions.

Thanks in advance.
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