All project land and water areas which are open to the public shall be available for use and enjoyment by the public without regard to race, creed, color or national origin. Each lessee or licensee of a project area under lease or license providing for a public or quasi-public use, including group camp activities, and each concessionaire of a lessee or licensee providing a service to the public including facilities and accommodations, shall not discriminate against any person or persons because of race, creed, color or national origin in the conduct of its operations under the lease, license or concession agreement.