My wife and I arrive in Brussels at 7:30am on July 23 and depart for vienna the morning of July 28.

I anticipate that we will go to Bruges for a day trip and probably Ghent for another day trip. Both of these trips will be via train.

July 23 - arrive early morning and visit Brussels
July 24
July 25 - Bruges?
July 26 - Ghent?
July 27
July 28 - depart for Vienna in morning

The dats for Bruges and Ghent are not fixed. Maybe better to avoid day trips back to back? or on certain days?

So it seems that I have two full days in Brussels, plus the basically full day on the 23rd.

Should we add another destination for another day trip? Something like Antwerp or Luxembourg? That would leave us with 3 days in Brussels (2 plus full arrival day) and 3 day trips. Is that too many day trips? Maybe Lux would be via rental car, but they seem pretty expensive just for a day thanks to what seems to be large taxes.

Are there any day trips that would be worthwhile for someone interested in a WW1 or WW2 cemetery/monument/battlefield? I'm guessing my wife won't be too excited about that part Waterloo?

Thanks!