None, but I'm trying to change that. One of the side effects of being self-employed is, often, one does not know when to stop. Luckily, I've realized that that's a very bad thing. I never get to take a real vacation because of finances, but I have finally planned two days off for myself in August to go camping with my sisters. It's been 5 years since I last did this.
Two days may not seem like much, but I never take more than one day off each week and have worked as many as 400 days in a row with no break. When I take a day off, I do it to spend more time with the kids and do work around the house that needs done. I still end up popping online to do bits of work here and there, or at very least to check my email and make sure my clients are happy. My two days' vacation will be without ANY electronics, and no kids, and no husband, and no housework. The last time I did it, I felt refreshed for about two months afterward. This says I need to try to do it MUCH more often, but I'll start with shooting for one complete vacation weekend every year :)