The volcanic cone of Mt Arayat (1026m) is a local trek that’s doable in a half-day from Clark or Angeles. Take a jeepney at the Mabalacat/Dau terminal heading to Arayat town, then take a tricycle to the park entrance, where you pay your fee and pick up a guide (mandatory). There are villas from P1200 if you feel like staying the night. A locally run 'Revive Mt Arayat National Park' Facebook page has more information.