Not just a national treasure. A WORLD treasure, and a rare gift. Celebrate his birth by buying/renting/watching a Miyazaki film. Spirited Away, Kiki's Delivery Service, My Neighbor Totoro, Ponyo, Howel's Moving Castle, etc. Your choice. You can't go wrong. Not a loser in the bunch!
PS: I LOVE Porco Rosso and Castle of Cagliostro, also. Actually, I love them all!
In a not-too-kind sort of world, Miyazaki's films illustrate a sort of humanity, gentleness, and love that is all too often missing from ours these days.