The district may study, construct, acquire, improve, maintain, and operate any and all modes of transportation within or partly outside the district, including, but not limited to, water transportation; may join with any cities, counties, districts, or state agencies, or any combinations thereof, to study and to provide any such mode of transportation as may be deemed by the board to be reasonable and appropriate to provide or to assist in providing transportation within or partly outside the district; and may pay for or finance, in whole or in part, any such study and any such mode of transportation.