I understand some restaurants add so and so % for large parties, but it was just the 2 of us. Our first dinner in San Pedro - thought that's the way they do things there. However, I didn't experience it w/ any other restaurants. I'm not the type to make the scene. But I felt that tipping is a voluntary reward, not mandatory when the amount is added to your bill and the customer has to pay it.
Oh..forgot to mention Manelli's coconut ice cream is delicious.