Below are links to field hockey camps that you might be interested in: 

Link to a database of camps: 
http://nfhca.org/

University of Maryland
http://advancedplay.org/?page_id=1543

McDaniel College
http://www.ussportscamps.com/fieldhockey/nike/mcdaniel-college-nike-field-hockey-camp/

Johns Hopkins
http://www.hopkinssports.com/sports/w-fieldh/spec-rel/camps-fieldhockey.html

University of Mary Washington
http://www.ussportscamps.com/fieldhockey/nike/nike-field-hockey-camp-at-the-university-of-mary-washington/