Something to not overlook also is Pinterest, on almost all of my popular posts I spend the time to make a Pinterest specific image for them. If you don't know how to use Adobe Photoshop you can use a free online tool like Canva to create images. There are also plenty of WordPress plugins that add pin buttons to your blog as well. There are plenty of ways you can use Pinterest to drive traffic, see more tips on Buffer's blog.
As an affiliate for Boatbookings, you will receive 20% of their revenue - effectively meaning your commission will be about 4% of any sales from your referrals. You also receive 10% of any commissions Boatbookings make on repeat customers who were your referrals. They do have a minimum charter value of 3,000 ($/€/£/etc) before commissions are earned.