Either take a bus/boat to a nearby hotel (SSR, OKW, POR or POFQ) then a bus from there to DHS, or take a bus to a hotel close to DHS (BW, BC, YC, Swan/Dolphin) and then take a boat or walk to DHS. If you take a bus to a hotel close to DHS, if you can, go Swan/Dolphin if you plan to take the boat, it's the last stop before DHS. Or take whatever the first bus is that comes to DTD and take a bus from that hotel to DHS.
Or take a cab. It will take much less time.