Bó’áo’s beach is a few hundred metres east of the main road. Head south down Haibin Lu, turn left at the Jinjiang Hot Spring Hotel and follow the road as it swings right to drop you off at a Chinese temple. The river hits the sea here and a long thin sandbar at the mouth is for very dubious reasons (go ahead and ask the locals) a popular place to boat out to.
If you plan to swim, head at least 500m north to avoid dangerous currents.