Judy,
That additional information helps a lot! I've never taken that particular tour, but I kind of assumed the Museum in Caen was the one you were referring to.
Regarding your tour of the Beaches, visiting La Pointe du Hoc, Omaha Beach, the American Cemetery, Longues sur Mer German Battery, the Artificial Harbour in Arromanches within only a 5-hour period is going to be a bit rushed (to say the least!) but it will give you a quick look.
Some info on the places you'll be visiting....
> Pointe du Hoc - LOTS of craters! If your Guide doesn't point them out, look for the Widerstandsnest positions. The Monument on the cliff edge is not accessible except during special ceremonies, due to erosion of the cliff (and danger of guests falling).
> Omaha Beach - it's hard to imagine what it looked like on 6 June, but it's easy to see the "elevated positions" that fired down on the beach (a former Soldier estimated 32K rounds / minute from the MG-42's, even with stoppages & barrel changes!). Given the circumstances, it's apparent to see why the casualty numbers were so high!
> American Cemetery -if possible, look for the headstones of two of the Niland brothers, both killed during the landings (there were 4 brothers in all). They were reportedly the inspiration for the movie Saving Pvt. Ryan. It's a large site & you probably won't have much time, so tour quickly!
> Longues sur Mer - only about 15 minutes outside Bayeux, and quite impressive as they're still somewhat "intact" (except for one of the Gun Bunkers that suffered an "unfortunate event" after capture). Be sure to take a Flashlight to explore the Command & Control Bunker, which is forward of the Gun Bunkers. If you've seen The Longest Day, you'll recognize the Command Bunker.
> Arromanches - not too intact, but still quite impressive to see. The pieces of the artificial harbour were massive!
Cheers!