My brothers an I often go to
Seacrets after a round. It is a great place to just hang out, even if it is still a bit cool out. Some other suggestions:
Harborside at the West OC harbor for a casual experience and some great food, original Orange Crushes, and is close to many of the courses
.
Fish Tales at 22nd Street on the bay is a great place to hangout, relax, and have some great drinks and food. They are open for St PAtricks Day weekend, but then closed until 10 April.
45th Street Tap House - If you want a casual atmosphere that is probably not too crowded with lots of different beers on tap.
Purple Moose on the boardwalk at Talbot Street - Great if you want some live music.
Hope you have a great round or two in OC!