First, why? If you want to obscure your tactics in hardening yourself as a potential target, you may not want to divulge anything about your approach so as not to minimize the efficacy of your efforts. However, consider that if an intruder abandons your home in favor of your neighbors home, the crime rate will go up, and your property value will go down. Worse, crime seems to have a magnetic effect. Once a criminal is successful, they often return since your neighborhood is a known commodity. In gaining comfort operating in your neighborhood, their surveillance tactics may well improve and your hardening may become a thin facade under improved scrutiny.
So, what to do? Well, without revealing the specifics of your implementation, you may want to suggest a neutral resource (such as this one) to your neighbors in order to educate them on methods of hardening themselves as targets. You also want to facilitate social activities with your neighbors. Doing this allows you to gauge the threat your neighbors may represent either directly, or indirectly. Indirectly you ask? Consider that if your neighbor flashes a lot of cash and drives a BMW, he or she may well be attracting the wrong kind of attention for your neighborhood. Once a bad guy is drawn into assessing your neighbor, what's to prevent them from targeting you instead? Organizing a neutral cookout, or block party in a common area (preferably not inside your home, but in your yard is fine, especially if you have the ulterior motive of casually revealing your dog house, dog bowl, the presence of an alarm system, deadbolts, hardened doors, intrusion resistant windows, or whatever visible strategic elements you've employed in order to simply make a trusted assailant aware that your location is not worth attacking.) Organizing or participating in a social event such as this will help you make friends with neighbors and probably enrich your experience living in the neighborhood, as well as that of your neighbors. You can also take note of anyone that seems "off", or of non-participants. Building a relationship with neighbors helps you reduce the trusted threat pool by eliminating potential intruders based on a personal relationship. We all get a sense of the general decency of folks we interact with, and while some minuscule percentage of those folks could be pretenders, the opportunity to expose them to the deliberately visible precautions you've taken silently educates them to avoid you as a potential target.
Neighborhood watch. While the signs are almost cliché, crime watch can be effective. As you build relationships of trust, having an effective coverage of neighborhood watch coupled with a mechanism for communication can be a helpful deterrent. If neighbors walk around in their neighborhood, appear to be observant, report suspicious behavior to alert their cohorts to potential or developing threats, and passively intervene during the process of surveillance, they can virtually shut down criminals. The whole neighborhood gains hardening points, and everybody benefits not only from prevention, but from developing friendships, social opportunities, and exercise!