Here's some links of interest:

• Reverebeach.com
  
• Save the Harbor/Save the Bay
  
• United States Coast Guard
  
• The Boston Harbor Association
  
• Boston Boating.Com
  
• Center for Coastal Studies
  
• Mass Audubon Society
  
• Boston Harbor Tide Charts
  
• Weather Underground
  
• The Department of Conservation and Recreation
  
• NJ Sandcastle Contest photos