C.P.
Treat him as you'd like to be treated. Flowers, love letters, candy. But add candles, lingerie, and steak. ;-)
Look him in the eyes and tell him how much you appreciate him. Be specific. Tell him he's a wonderful provider. That you love how well he takes care of his family. Tell him you are proud of him; proud to stand next to him and walk with him in this life.
Above all, men want to be accepted and appreciated. Tell him...men don't read minds.