From the airport head south on the one and only road. the first bay that you come to is Marigot. continue heading south. At the top of the next hill you are entering Pagua Bay. If you can't see the surf breaking it is either flat that day or you need to change your glasses. LOL
When I was there there where waves breaking all over the bay. Nothing really great but lots of white wash for beginners. There is a large river mouth toward the south. Never got a chance to surf the waves on that side. They were smaller but held up better.
Overview
Atmosphere
Its got a nice sandy bottom and lots of white wash if your are still a beginner. Biggest problem is the waves closes out to fast to get a good ride. Maybe with a different tide or swell it would be better.