I live in the Washington, DC area, and I'm always looking for new places to walk. I was excited to see this product; it promised to take me places I might never have seen before.
But, for someone whose primary interest is the actual walking, I've been disappointed in the cards. They don't tell you how far any of the walks are, so you're really guessing by looking at city blocks or landmarks. And while they call these 50 walks, some of them are only a few city blocks, so I'd hardly count them as 50.
If you're touring Washington for the first time, this is probably a great way to stroll by monuments, memorials and museums and a few parks. But if you live here and really want to get out there and walk, check out some of the other walking books instead.