To add to Iany's comments, you have a good opportunity to effectively
SEO this site for some targeted keyword terms. I would recommend some targeted Home page efforts for the specific destination, such as yachting in kefalonia, kefalonia charter yachting, etc (it will be an uphill struggle to gain SERP for Greece). You can experiment on the other pages but the keywords you have now will be largely ineffective. Try some logical search terms (kefalonia charter tours, kefalonia day charter, Yachting on the Corazon, etc, etc). I recommend you stay with a general theme (strategy) within your pages rather than scatter gun keywording.
Then these need to be taken into the meta-tags and the content. Highlighting the keywords in the content may need to be rationalized with the owner of the site but it is probably worth changing some of the content, such as your H1 titles. Use photos in your pages and take full advantage of the alt and title tags as part of your keyword efforts.
This is not a huge undertaking but this site has opportunity to enjoy some favorable SERP even with some simple efforts. Naturally there are many more avenues to pursue but that will depend on the importance to the owner of taking the usage of his yacht well past 10 weeks per year.
On another note you have not generated your site map. This is a very worthwhile effort, make sure you submit the site map to search engines that allow this when you register with them at launch. Launch, an appropriate term in this case don't you think?
Also, how about considering center monitor for viewing this site. We have polled many, many people on this issue and the large majority feel that a page centered site appears more professional. You can try this...
Add to css style file
#wraper {margin:0px auto;padding:0px;}
Then add to the content body
<div id="wrapper" align="center"> content </div>
Good luck with the site.