We really love Duke's - great location on the PCH with excellent views. Valet parking is a nice plus and there is the bar section you can eat at (first come, first serve) if you don't want to wait for tables, which is what we usually do.
The food at Duke's is excellent - highly recommend the turkey sandwich or the pork mac n' cheese. But of course, the best part of Duke's is the Hula Pie - macadamia ice cream cake on an Oreo cookie crust with a chocolate icing of sorts on top, with whipped cream drizzled with chocolate. Go for the ambience, great food, great views, and great desserts.