You might enjoy the journal of my husband's sail from North Carolina to Belize (there's a little bit about sailing in Belize and to the Rio Dulce too) at: //www.ambergriscaye.com/xaloc/ (at least you'll learn a few things NOT to do!!).
There are pics of the sail at:
http://www.imagestation.com/album/?id=4291565679 for pics of our sailing around Belize and to the Rio Dulce, check out:
http://www.imagestation.com/album/?id=4291565063