These may seem obvious, but it's never a bad idea to reinforce core traffic-generating methods.
1. Add interactive features to your site, such as guestbooks, message boards, online polls, postcard services, or chat rooms. These features increase the "stickiness" of your site, that quality that causes user retention ... in other words, repeat traffic.
2. Encourage your visitors to participate in the creation of your site. For example, add a classified ad section, or a links submission page, or a feedback form that allows users to post their comments.
3. Provide valuable information. This may sound like an obvious piece of advice, but it is surprising how many websites really don't offer much else than a glowing tribute to themselves. Do some digging, offer real information about the topic of your site, like recipes for a cooking site, or a photo swap service for an automotive site.
4. Add a sweepstakes, or prize draw, preferably by giving away something pertinent to your site. If you have a travel site, a digital map or a downloadable gift certificate could fit the bill.
5. Offer links to other sites that offer services you may not be able to provide. An example might be a link to a free search engine submitter for a webmaster-related site; or a link to a currency converter on a travel site; or a link to a mortgage calculator on a real estate site. People will remember your site as if you were actually providing the service.