When I was younger I'd strap my babies to the back of my bike and take them anywhere I was certain I wouldn't fall off, but these days I'm more cautious and they are too old to strap to anything (6 and 8). About the only thing I have to find sitters for is exercise, I use the daycare at the gym and when I go on rides I use a sitter. I thought I'd pass this along for other parents in the bay area: http://www.caresquare.com/ it's a free site that pairs parents and childcare, very well set up and much easier to use (and more fruitful) than craigslist.