Basic elements of a charter site:
1) About & what to expect
2) Rates
3) Captain
4) Boat
5) Pictures of happy people with fishies...
Here are a few that I have done
http://www.avemariacharters.com
http://www.billandjulsfishing.com (about to get revamped)
http://www.candocharters.com
one I'm working on now:
http://www.GotStryper.com
They follow similar patterns but get the key elements in. Some change a bit in how dynamic they are and how easily they can be updated...
The BEST thing I can say is that quality quality shrap and colorful images makes a site more than anything else... You also want clear and concise text and verbage in the point you are trying to get across. When I do a site, I don't decide what to write (though I may offer a suggestion) but try to capture the flavor of what the client wants...