I love https://maps.google.com/ (actually I like it a lot). They give options for using car, walking, public transportation, and BICYCLING.
We use this feature when we are going various places on our bikes. Today, we are planning a trip to a Kohl's in WI.
Another good reference is http://www.traillink.com/home.aspx, which is a Rail to Trails Conservancy site, which partnered with Google for mapping various trails.
Another feature I like is the ability to add to the bike maps via the Google Map Maker. Also at Trailink you can input trails and remarks.