The prospect of retirement

I'm still working as a technical consultant in a non-profit organization so you can say I am not earning well. But I enjoy my job and since we are financially okay so the salary is not an issue. However, my concern is what would I do when I finally retire? It would be boring to just stay at home every day of the week. If we go out and go on vacations, that would entail much expenses. I don't see myself in front of the computer earning my keep because it is not a life for me.

So what can I do not to be bored when I retire from work?