Learn Something New
Take a class. Maybe it is that drawing class you always wished you had time for. Or maybe it is a skill that will make you more marketable when you are ready to go back to work.
Read a book. One from that pile you bought that you never got around to. Learn how to use Google Reader so you can start reading more blogs than just this one.
Think about what you would REALLY want to do if money was no object. If it's not what you were doing, then see if you can figure out a way to make money doing this new thing. Maybe this is the time to just do it.