I would take the FIRST bus to arrive at DHS between Magic Kingdom,Wilderness Lodge and Contemporary Resort and then take a boat to Fort Wilderness form either of those.
You would then have to transfer to an internal bus to get to the HDDR. Since you have to make a transfer anyway, mesaboy and WEDWDW recommended a bus to a MK, CR, or WL and then the boat to FW because the boat dock is just a short walk to Pioneer Hall, where the HDDR takes place.
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