There are Federal Aviation Regs...
101.7 Hazardous operations.
(a) No person may operate any moored balloon, kite, unmanned rocket, or unmanned free balloon in a manner that creates a hazard to other persons, or their property.
101.13 Operating limitations.
(a) Except as provided in paragraph (b) of this section, no person may operate a moored balloon or kite—
(1) Less than 500 feet from the base of any cloud;
(2) More than 500 feet above the surface of the earth;
(3) From an area where the ground visibility is less than three miles; or
(4) Within five miles of the boundary of any airport.
(b) Paragraph (a) of this section does not apply to the operation of a balloon or kite below the top of any structure and within 250 feet of it, if that shielded operation does not obscure any lighting on the structure.
This is the reason for the no kite zones on Maui...
http://www.mauikiteboardingassociation. ... emaps.html
They have a FAA Waiver that allows kitesurfing activity within the 5 mile restricted zone too (needs to be renewed every 2 yrs). More info about all this at that link.