JAL, the Mother's Day buffet at the Pelican Hills Golf Clubhouse will knock your socks off.
It is a little over $50 for adults and price varies with age.
I went a few years ago and it was excellent, fresh, traditional, and gourmet. They had a piano, a large hall for eating indoor or patio for eating outside, and an open bar where you can also order small appetizers off the menu.
Call them at (949) 717-6000 and asks them some questions. The valet is complimentary, the view of the blue Pacific from beyond the golf course greens is beautifully expansive. The service, etc. is quality controlled by the Four Seasons Hotel.
And just wear what you are comfortable in. They'll love you.