While there will be a couple selections below - I really like this site. I've done a half dozen charter sites in Joomla (before I got RT) and I know the industry in the US. What you have done here will positively influence what I do in the future with guide sites.
Here are a few of my thoughts:
1 - I'd give the Captain his own link on the main Navbar as that is often as much draw as the boat - and you have the room
You also should add more pictures of the captain and mate as prospective clients seeing a "team" might feel a little more comfortable oppening the wallet. I'd say do a slideshow below the text (maybe make default text one size larger??)
2 - The Boat;
Interior - Get up some pictures of the salon area, this may sell some "other halves" into going with Hubbys on the trip. More pics - Use a slide show under. Show the boats "State of the art electronics"
Exterior - same as above - show the big cockpit area, show the fighting chair with someone doubled over on a Giant ;) - You have great photos - use them all over ;) - they can be in more than one spot.
3 Add some pics to the "options" Page - you want people to drool
4 Technical - get all measurements into standard or metric ??
5 Lighten up the Fish Santana in the logo - it is a bit washed out with dark on a dark background
You did a very nice site - I really like it - and you have great graphics to work with to further use them ;)