Within the protected Peradayan Forest Reserve , it is possible to do a 2km (one way) hike to the top of Bukit Patoi (310m). The well-marked trail, through pristine jungle, begins at the picnic tables and toilet block at the park entrance, about 15km southeast of Bangar (towards Lawas). To get here from Bangar ask around at the jetty for an unofficial taxi (about B$30 return). Bring plenty of water.
Once you reach the peak, enjoy the views then turn around and come back down; in theory it is possible to continue on to Bukit Peradayan (410m), but the path is poorly maintained.
If you want to explore the Bruneian rainforest without the logistics and expense of a trip further upriver, Peradayan Forest Reserve makes a good alternative that can easily be done as a day-trip from BSB.
