when i first checked out Vigan, I was surprised that such a tourist city is not much covered by OSM. I visited it last week was able to map the major roads plus a few roads with FIXMEs just to seed...

also some sort of visita iglesia took to me various unmapped town centers: tagudin, sta. cruz, sta, lucia, sta maria, candon even hidden beaches of apatot san esteban and sulvec in narvacan