I know this sounds dorky, but living a sober life really is it's own reward to me.
I look back at the way I used to live and the way I used to be, and I'm grateful for the peace and happiness I have now.
Suki's right about alcohol not being a reward - not for people like us.
There's many other way to reward yourself - some people treat themselves to candy, others exercise & get the endorphins going, others watch a funny movie - why not save all the money you'd usually spend on booze and buy yourself something nice?
D