Wish we could list 3. lol Most important: health and family. It's by process of elimination for me. Superficial things like fame, good looks and wealth don't technically bring true happiness. You could have all the money in the world, but if you're sick and have no family to share it with then what's the point?
So if you have good health and a strong family, nothing beats that and it can fuel other good things.

I'm grateful everyday for my health and family. I wouldn't consider myself wealthy but when I started making more money it really put all this into perspective. When I was younger I probably would have said wealth but the things that make me truly happy don't involve money.