You can be a Water Saving Hero like Hana Newman, who stopped her toilet from running.
Wouldn't that be cool?
If you don't have any ideas of your own, you could check out the Bay Area water agencies' conservation campaign, "Water Saving Hero."
(There are also all sorts of ideas on where to get free schwag that'll help you cut back on your water usage: like toilet flappers, low-flow shower heads, etc.)
Oh, and you don't need to be in the Bay Area to get something out of this site -- I mean, we can all use more conservation tips, right?