The commission¹ is empowered to make a survey and place suitable landmarks; to make a general plan for improvements, which shall be submitted to the proper department of the United States Government and to the Secretary of Internal Affairs² of Pennsylvania for their approval; to enter into contracts for the building of roads, planning, engineering, dredging, filling, bridging, erection of docks, erection of necessary buildings; to grant reasonable leases and concessions, including leases for a period of years, subject to proper restrictions, for the establishment and maintenance of a suitable harbor for yachts, and the use of sufficient lands, not exceeding ten acres, for the erection of yacht club buildings; to control waterways, ponds, lagoons, drives, walks, and ways, the operation of boats and small craft, docks and landings; to provide against encroachment on said lands, channels, and all of the shores of Presque Isle Peninsula and the waters adjacent thereto, and the lands under said waters to a distance of five hundred feet out from low water, as well as all of that part of the Bay of Presque Isle known as Misery Bay, together with the lands thereunder and the shores thereof, and wharves; and to prevent nuisances or pollution of land or waters which are given over to this commission; and to enact rules and regulations for the protection of all forms of wild life that may be encouraged in the woods or ponds or adjacent waters; and for the prevention of encroachments not inconsistent nor in conflict with international law or any Federal laws, rules, or regulations: Provided, That under no consideration is any timber to be sold or removed from the peninsula, and such timber as may be required to be removed for making of ways and roads is to be used in construction work on the peninsula.