Mass. Gen. Laws ch. 132A, § 2B: Nature of use of acquired lands

Section 2B. It is hereby declared to be the policy of the commonwealth that all such sites acquired or developed by the commissioner shall in so far as practicable be preserved in their natural state; that they shall be in so far as possible collectively self-supporting; and that no commercial activities except those essential to the quiet enjoyment of the facilities by the people shall be permitted.