Juno Beach Centre,,,,well,, GO, just to say you where there.
Yes, as everyone else above has pointed out, it could be a little more inviting.
There have been some great ideas posted above on what to see.
If this is a one and only trip, try and catch as much as you can.
Again, only if this is a one trip adventure!
I will say the opposite of going to see the museums.
If your time is short, skip the museums and cover as much ground as possible.
The museums will suck up the day real quick, yes they are fantastic, but you are there to follow the footsteps.
You can see a lot in one day.
The American Cemetery is also a must see.
If you have time, La Cambe German war cemetery.
I have toured the battlefields in these areas extensively for many years, France, Belgium, Germany, Netherlands, etc, etc.
Research well in advance and draw a line of route for yourself, everything is pretty close together.
Bayeux, France is one of my most favourite cities in the world.
Last, but not least, don't forget to snag your self a bottle or two of local Calvados.