There's definitely no boat from Contemp to MK. So just WL to MK then. Does FW have it's own boat to MK I wonder.
And the loop,around Bay Lake is the one I love. It's the route that we use each time to go to HDDR. It can vary as to which way the loop goes, and at busy times they have 2 boats circling in opposite directions. It runs all day and it's a lovely way to chill and spend a little time before jumping off (not literally) for a bit of resort hopping. I took it from Contemp to WL to FW to Contemp to WL and then explored WL decorated for Christmas.