WLD has many problems, stat blocks are one of them. One nice thing though is the monsters are all basic ones from the MM so it would be easy to just switch out the Pathfinder versions.
Most, if not all 3.5 materials convert to PFRPG with a small amount of math and substitution of PF versions of monsters (when available). Keep a close watch on CR ratings, there's a BIG difference between editions!
that adventure WAS THE BEST DEATH TRAP I'VE EVER BEEN SUCKED INTO
the final battle was epic, the other battles were epic, everything was epic, the only epic part was "Truedeath is Chalachia's Bane"
totally missed that one
I ran Secrets of the Smuggler's Cove with no problems at all. I tied it in with the old TSR adventure The Sinister Secret of Saltmarsh. That took a bit more work, but I was able to do simple substitutions.
There used to be quite few conversions for old 1E modules to 3.0/3.5 on this site. I thought Saltmarsh was one of them. Back to the OP, there really shouldn't be any problem running a 3.5 DCC module with PF.