Go to the visitor's center on Race Point Road and get a pass (free) that will allow you to park in Herring Cove parking lot at night.
Walk the beaches after dark and plug away! I've caught some nice fish that way.
Three-fourths of the Earth's surface is water, and one-fourth is land. It is quite clear that the good Lord intended us to spend triple the amount of time fishing as taking care of the lawn.