Dedicate the fourth day of your trip to immerse yourself in the local culture and cuisine. Visit the nearby town of Norzagaray and explore its historical sites, such as the Norzagaray Church and the Bahay na Bato. Take a stroll through the town's streets, interact with the friendly locals, and learn about their traditions and way of life. Indulge in authentic Filipino cuisine at local eateries, trying dishes like adobo, sinigang, and halo-halo. Don't forget to visit the local market to buy some souvenirs and traditional handicrafts.