The dramatic 3-stage falls create a natural and relatively safe swimming pool, which is popular with both locals and visitors alike during the warmer months. Beautiful nature photography is a possibility here, as is just hanging out and enjoying lunch in a relatively pristine and quiet piece of natural Cambodia.
A planned tourist development here never really took off to Bou Sra Falls remote location, although there are non-pushy vendors selling snacks and souvenirs if you're in the mood for refreshment. It's a good idea to hire an English speaking driver/guide to explain what you're looking at and provide interesting background information.
Only relatively skilled bikers should attempt this twisting and gravelly road by themselves, and exercise extra caution in the muddy season.
In the opposite direction of Bou Sra, there are several smaller, closer waterfalls that are near Phunong villages and are pleasant places to take a self-driven moto and hike around. To reach them, drive down the main road in town that goes by the market and head straight out of town. Follow the turn to the left 7 km and you'll reach the small Sen Monorom falls that nonetheless offers great cliff jumping.
Further down the main road, on the second left turn another 17 km is Kbal Preah Waterfall. It's larger and right next to Domrai Choan village. Trips to these falls can be arranged via most any tour guide company in town.