Check out this great website: www.runningahead.com where you can keep a running log, input your running routes on Google maps and more! Route distances are calculated for you, plus elevation maps, and many other cool features. All FREE! You can see other people's running routes too if they're not designated as private. Tip: after creating your free account, go to your profile and set up your default location on the map - then each time you create a new route you'll be starting in your own neighbourhood instead of a map of all of North America.
Check out Halfmoon Bay to see all the routes we've already put in, including the club run 5km and the April Fool's Run. You can switch to 'hybrid view' which shows the satellite image and the map, handy if you're adding trail portions to your route - often you can actually see the trails and other landmarks!