If your pastor doesn't need help (Or maybe doesn't want help), perhaps spending time growing your relationship with God. It is addictive, you know.

reading Bible, Biblical studies, etc...
if you aren't or don't choose to be "sparetoooooel" (southern slang that must be heard to understand, that means "things of and pertaining to being a spiritual being"); you could prepare some "freezer dinners". make some meals ahead of time, and put them in freezer bags so that you have them at a moments notice for supper/dunner.
Along those lines, cookies. having pre-prepared cookie dough in the freezer is a good idea. Some dough's do this better than others. in fact, even cook lots of batches of cookies and prep for the freezer. again, some cookies don't lend themselves to be frozen, especially if you have favorite that must be eaten warm-out-of-the-oven - then the frozen dough would be better.
then there is always the old stand by, but this takes more pre-planning... you could acquire season, boxed sets of DVD's of your favorite TV show and marathon. This is especially time consuming (wasting?) if your show is off the air, after 9 seasons and a movie. If you don't' own the series already, you could probably get many of them at the library. In fact, you may be surprised at what might be at the library!
I remember one of the times when I was a bachelor (:) hehehehehee) and was sick at home for several weeks. I spent the time studying and cramming for a technology certification (anyone remember 3Com's "3-Wizard" certification, yes, I am a Wizard). As a teacher, isn't there any education extensions, or supplements or anything like that, that you could be doing, distance learning, online learning, Computer based training, etc?