One of the best ways to use twitter and other social media platforms is to run contests and polls. People can't resist entering or voting.
Aloha Beach Camp's running a contest right now on twitter where you can win a free rash guard.
Here's the blog post about it if you want more info. All you need to do is follow Aloha on twitter, make a "tweet" from your own twitter account and include #alohabeachcamp in that tweet. Good luck!