Give em a show for being nosey! I had a woman like that once so I spent the day walking around naked. She was so appalled that she stopped looking in my windows. As for noisy you can talk to them. We have some people up the street from us that are noisy as all get out every weekend and we had to end up having a talk with them about it.
i like heather's answer. give them something to watch. have fun with it. why not? don't take them or yourselves too seriously and put on a mini play when you catch them watching. mess with their heads. since you entertain them, why shoudln't they entertain you too?