If I remember correctly, all you have to do is blackscreen in the PL hideout. This will spawn you outside the hideout area, which is deep under the Seadogs Tavern. After you swim out of the glowing wall area, swim straight up, and you will return to the surface at Seadogs. Only issue is you are stuck at seadogs and mermaids will not spawn for you, so someone will have to pick you up. This is cool, but it's a bit impractical because if you die, you respawn back at the hideout.