IntramurosConsistently the top recommendation for visitors, and worth allowing a half day rather than squeezing it between other stops.
Local culture beyond the checklistManila Ocean Park and nearby Taal Volcano are where Manila feels least like a tourist itinerary and most like the actual city.
A well-known second stop: Fort SantiagoRounds out a first visit nicely alongside the bigger-name sights.
Easy onward travelManila's transport connections make it simple to extend the trip into the rest of the Philippines if you have the time.