Even if they get your IP, so what? Consider the media ramifications of them bursting into some old lady's home in the middle of the night and giving her a heart attack, then finding nothing except an unsecured wireless router. Lawsuit city there.

For security, as mentioned: no parties, no disturbing the peace, no loud dogs barking, no hippies coming over if you can avoid it, no large amounts of foot traffic, nothing in sight from any window or from aircraft, no smell, and never put incriminating stuff in your trash. If you have to dump some trash, dump it the same morning they pick it up, and dump it in a trash receptacle at least a block away. Also, I highly recommend having lots of potted plants and/or a garden around, so if you should need to get some deliveries, you've got a clear, visible purpose for such things. Plus, it's healthy and good for the environment.