The best beach around Santo Domingo is Juan Dolio. It's even better than Boca Chica... The beach is cleaner and more quiet than Boca Chica. I even like it better than Punta Cana (Bavaro).
But see for yourself...
This is how you get to the beach, if you're in Santo Domingo. The bus stop is in La Duarte, close to the bus stop to Punta Cana:
Astrapu Bus Stop
Calle Jose Martí
10214 Santo Domingo
This is how the bus stop in Santo Domingo looks like. The last stop is San Pedro where also most of the people go. Therefore, it's important to tell the driver where you would like to go.
Go inside. This is how the ticket office looks like.
The bus is clean and has air-condition. It's also quite large and comfortable. I can highly recommend it.
Be sure to buy the ticket before you enter the bus. The ticket costs 110 Pesos, which are about 2€. Furthermore, tell the driver where you would like to go so he will stop and tell you. The trip lasts about 45-50 minutes depending on traffic. Sit on the right-hand side, if you want to enjoy the scenery. It is quite beautiful, as the route is along the coast.
This is where the bus stops. The bus to Santo Domingo stops on the other side of the road. Be careful when you cross the street! It's dangerous.
When you follow this street and turn left, there's the beach.
Enjoy your stay! There will also be an upcoming blog post about wooden figures which you can buy at the beach...