The small town of NARRA, about two hours by bus and 92km south of Puerto Princesa, makes a good introduction to the south, with several empty beaches in the area and Rasa Island, 3km offshore, the only place in the wild you can see the endangered Philippine cockatoo (there are around 70 birds here). The island is a thirty-minute boat trip from the village of Panacan, a short tricycle ride from Narra. Further offshore, the Isla Arena Marine Turtle Sanctuary is a major nesting site for green turtles, where the tiny hatchlings are protected before being released into the wild.
Inland, the most rewarding excursion is to the Estrella Waterfalls, around 15km from Narra on the road back to Puerto Princesa. The water is wonderfully fresh and pure (you can swim here), and the falls are surrounded by lush jungle inhabited by monkeys.