With my disease of alcoholism, I couldn't live in the present. I was either upset about the past or longing for the future. So, in the present, I drank to cover up those feelings.
Now, I try very hard to focus on right now and to find enjoyment in what I am doing right now.
In early sobriety, I had to fill the time with meetings or activities that I almost forced myself to do to stay busy. Over time, I realized how much new time I had to do things that I enjoyed and that helped me grow as a person.
So, if you can't think of anything to do or you are starting to feel bored, go to a meeting.
Also, try to re-start those activities that you used to like to do years before -- you might find that you really like them again.
If all else fails, go help another alcoholic.