Data resources for Hawaii and the Pacific:

Federal

• NOAA: Pacific Services Center (PSC)
  
• NOAA: Coastal Services Center (CSC) - Land Cover
• PDC: Pacific Disaster Center
• USFWS: U.S. Fish & Wildlife
• USGS: Hawaii Data Clearinghouse
• USGS: Surface Water Data

State of Hawaii

• Statewide GIS Program

University of Hawaii

• Coastal Geology
• Hawaii Biodiversity & Mapping Program
• 
  

Hawaii Counties

• City & County of Honolulu
• Maui County
• Kauai County
• Hawaii County

Links to other sites:

• National States Geographic Information Council (NSGIC). HIGICC is an institutional member of this geospatial information and technology advocacy organization.
  
• GIS Sites in other states (courtesy of the Ohio Geographically Referenced Information Program -- OGRIP).