found this on the Net, click on the Send Feedback link and scroll down to the add bike trails and hit "suggest it"
The Google Maps Help section has a ‘Send Feedback‘ link that allows you to vote for new features you want to see on Google Maps. One of them is called ‘Add bike trail information and biking directions’. Please feel free to head on over the click the ‘Suggest’ button next to this feature.
To navigate there from Google Maps, click the Help link in the top-right, then ‘Send Feedback’ on the right.
The ideal would be to vote for (’Suggest’) just the ‘biking directions’ feature — that would probably help make it stand out a bit better — but feel free to vote for other features you really really really want, too.
If you’re feeling particularly frisky, you can head over to the Google Maps Help Group and ‘Post a question’ to the ‘Features Requests / Suggestions‘ Google Maps Group. Any details you add about why you want this feature and how you would use it are a great way to show support for this feature — it really helps the engineers and product managers at Google know what you want. So, you’re answering the question, “If Google Maps adds bicycle directions today, how will I use them tomorrow to get where I need to go? How will they help make me safer, my life better, etc.?”
I know I’ve posted in those groups before, but I’m going to try to get back in again with a good example. For whatever reason, I can’t seem to get a good mental map of San Francisco in my head, so I’m constantly heading to the San Francisco Bike Map hanging on my wall to figure out how to get somewhere. It usually includes leaning over furniture and zooming my face into the wall, trying to get a close-up of street names and things like that.