East of Grand Case on the eastcoast of St Martin, the snorkeling at Baie Orientale is known for sand flats and sea grass. On a calm day, there is good visibility and the rocks at the southern end have the best snorkeling.
To reach the snorkeling on Saint-Martin by air, fly into Princess Juliana International Airport (SXM). Note, there is a $30USD departure tax collected at the airport.
In addition, there is a ferry called Great Bay Ferry that interconnects St. Martin with St Barts.
Overall, Baie Orientale is the 8th most popular snorkel dive spot of all 10 snorkeling dives in St Martin.