I've gone out there a couple times in '93 and '94.
For me, being an American, the stand out place was the American Cemetary above Omaha Beach. Very moving. The whole area has some old fortifications.
A short ride from there is Pointe du Hoc. Definitely worth a visit.
I used Bayeaux as my base in '94. There is a British cemetary there where I was moved to tears by reading the inscriptions carved into the headstones.
Enjoy your trip and tke lots of pictures and make sure you post 'em for all to see.