Whenever it shall be made to appear to the satisfaction of the President of the United States that yachts used and employed exclusively as pleasure vessels and belonging to any resident of the United States are allowed to arrive at and depart from any foreign port and to cruise in the waters of such port without entering or clearing at the customhouse thereof and without the payment of any charges for entering or clearing, dues, duty per ton, tonnage taxes or charges for cruising licenses, the Commissioner of Customs may authorize and direct the customs authorities at the various ports of entry of the United States to allow yachts from such foreign port used and employed exclusively as pleasure vessels to arrive at and depart from any port of the United States and to cruise in waters of the United States without the payment of any charges for entering or clearing, dues, duty per ton, or tonnage taxes, but the Commissioner of Customs may, in his discretion, direct that such foreign yachts shall be required to obtain licenses to cruise, in a form prescribed by him, before they shall be allowed under the provisions of this section to cruise in waters of the United States. Such licenses shall be issued without cost to such yachts and shall prescribe such limitations as to length of time, direction, and place of cruising and action, and such other particulars as the Commissioner of Customs may deem proper.