Waterway Family Medicine. 3600 Sea Mountain Hwy Ste C, Little River, SC, 29566 . Grand Strand Senior Care ... Scheduling flexibility . Grand Strand Primary Care. 4237 River Hills Dr Ste 150 . Little River, SC, 29566. LOCATIONS. Grand Strand Primary Care. 4237 River Hills Dr Ste 150. Little River, SC, 29566. Tel: (843) 281-2778. www ....