First, you pick when you are going to have your "me" time. Are you trying to schedule an hour a day, or a few days together over a holiday? If it's a holiday, and you don't want to go, discuss it with the people closest to you (DH?, S/O?). Then just tell the other relatives. You can say that you aren't going to make it, because you have other plans. You don't have to be specific. If you're looking for an hour a day, just schedule it, and then turn off your phone and don't answer the door.
I've done both. I sent my DH and some of the kids to visit his family, and I stayed home. My DH knew that I needed to be alone for a while, but the relatives heard that I had some work to do. That was enough. They didn't have to know that my "work" was to do nothing except what I had to do, so I could enjoy some peace and quiet!
at 2:05 AM on Jul. 9, 2011