What is the best way to see the D-Day beaches? Tours, bike, car, ect.?

This is the perfect opportunity to browse some blogs... I just did a quick search for Normandy and found a few.

These people drove a car around France:
http://www.travelpod.com/travel-blog-entri...42520/tpod.html

I can see in this blog's earlier posts, that they also had a car:
http://www.travelpod.com/travel-blog-entri...06200/tpod.html

And wow! Here is a motorcycle trip through Europe:
http://www.travelpod.com/travel-blog-entri...70640/tpod.html