Pamulaklakin Forest Park is the surviving piece of the US Navy's jungle survival school, now run by the Aeta indigenous community who guide visitors on the trails their ancestors used. The half-day jungle tour covers traditional plant uses (medicinal herbs, fish poisons, edible roots) and demonstrations of fire-starting with bamboo and tree-bark cord-making.
For a higher-adrenaline option, the park has a zip-line course strung between forest canopy platforms, and an obstacle course of rope bridges and rappelling stations. The park is about 5 kilometres into the freeport from the Olongapo gate.