USGS geodedic marker

Go IslandCaching

IslandCaching is a hiking-based "treasure hunt" that guides you to some of the park’s most important places. Use your own Global Positioning System (GPS) unit and clues provided by the IslandCache Site Sheets for a fun day in the park. To make your visit a memorable—and educational—experience, please read the guidelines and suggestions below.

Please Note: Geocaching with traditional physical caches is not permitted in the park.


  • Go to IslandCache for more information.
  • Send email with any comments, questions or suggestions about the IslandCache Program to: Park Ranger

Park Map

Boston Harbor Island Map

Ferry Schedule

Ferry Schedule