I have many for different reasons.

Guy watching and surfing: Waimea Bay, Velzyland, Hale`iwa (all on the North Shore). I never surf NS during the Winter. I value my life.

Bodyboarding: Makapu`u or Sandy's

Sunning my buns: Lanikai, Kailua, Malaekahana or Queen's Surf

Heaven on Earth: Makena (Maui) and Anini/Kalihiwai (Kauai)

I'm spoiled. I don't think I could ever appreciate any of the other beaches on the mainland.