The surf is mostly up in Punta Cana! But Punta Cana is famous for its "Punta Cana Breeze". Once these winds appear your surf trip automatically ends because the waves are flattened. The best surfing is along the Dominican Republic's northern coast. It doesn't matter whether you have never surfed before or are already an expert - you will love surfing there.
Macao, northwest of Bavaro, is one of the best places to surf in Punta Cana, with two to five foot waves that break left and right and a safe, sandy bottom. It's advised to buy or bring your own surf board as most hotels do not keep them on hand.
You can find more information about surfing at Macao and around the Dominican Republic at WannaSurf.