The bridge and park commission shall have power to construct, build, maintain, operate, reconstruct and repair a bridge or bridges, a ferry or ferries, a causeway or causeways, or a tunnel or tunnels, or any combination thereof, connecting any island acquired, in whole or in part, by the commission, with the mainland. The point of connection of any such bridge, causeway or tunnel with the mainland may be within or without the corporate limits of the municipality in the case of a municipal agency and may be within or without the county limits of the county in the case of a county agency. Said commission shall further have the power to acquire by a gift, grant, purchase, the exercise of eminent domain, or otherwise, land for approaches to any such bridge, ferry, causeway or tunnel, and to construct, build, maintain, operate, reconstruct and repair approaches to any such bridge, ferry, causeway or tunnel connecting any such island or part thereof with the mainland.