View attachment 564530
The marina is an the area known as "The Settlement". The marina is #11 above. Trails End & Hoop Dee Doo (which are both currently closed) is #12. As they had mentioned, the golf cart parking and bike racks for the marina are where I put the blue X on the picture. The other golf cart lot is right there where it says "AED" in that big grassy area (it's not grass, it's gravel.)
Keep in mind as well, right now, they also offer a bus to the Magic Kingdom from the Settlement Depot (item A on the map but more over by where the bus is pictured.) If the line is long for the boat, take the bus. It's super quick.