When making the map, on the first page there should be a box you can check which says 'Has Portal'. This links your map to the cape and then you type in the exact location you want the portal to be using X, Y and Z axis. So...basically you could set this portal to be on a hill or in a cave maybe, and this portal would take you back to the cape. You may need to test the map a few times to see where the portal appears (or at least I do xD so I set the portal first and build the map around it). Anyway, I digress, just check the box thing and set the portal
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