Name the extra pages to match your main keyword for that page like boats.html or cars.html. Find other sites in the same category as your own and exchange links with them. Use the search engines to find the sites that rank in the top 20 or so. Surfers love to surf. Be selective in choosing your linking partners as you are sending them your visitors so it is a reflection on your site's quality as well.
Good sites link good sites.
Its a Manohar presentation.