We took this day long tour while we stayed in Bruges for 4 nights, 3 1/2 days. It was recommended in Rick's book. It was outstanding. A husband/wife team run the company; she is British, he Belgian. To the English and the Commonwealth nations, these battlefields are like Americans going to Omaha and Utah beach. It was an emotional, highly educational and diverse full day experience. If you choose you can stay late to see the ceremony at the Menin Gate which is done in full uniform with music and a bugle. The day's experience will take you to monuments, cemeteries, old trenches that remain, places where old ordinance has been dug up from farmer's fields, etc, etc. In one area the US soldiers fought and there is a monument to them. It is for the most part flat to slightly rolling countryside. Keep in mind that nothing you see will be more than 100 years old. The area was devastated in 1914-1918.
When we return to Belgium or northern France we will surely also go to Waterloo which is not far away but we didn't have time for both tours.