I can't comment on the whole Google API offers, but I use Moves and I really like it. I was initialy meant as a low-level excercice tool but they steped a little away from that and designed the product more for life-loging, and this is gold for me: I can, every week or so, look back at what I did. I make a personal effort to do something new every day (buy a vegetable I've never taste at the supermarket, try a new restaurant, walk another route to work) and that app covers a lot of that -- not always directly, but it reminds me of context. "Why did I walk that much that day? - Click to map - Oh, I went through that park back home. Yeah, that was when my boss really got in my guills, and I needed the Sun." Including photos, notes would make is more explicitly so, and Moves has more of a low-feature general approach, but what they have makes sense.

It's not about getting a dog as much as having something that archive (your memory sucks at that) and tells you if you have the regularity that such a responsability entails: I can't. I can tell you I got home after 10 more than half the past month, but not because I remember it: because Moves let me see so.