WW1 Sites, places, must see and stops. Questions?

Putting a sort of a loose plan together to go over and spend some time in and around Northern France/Belgium at the World WW1 sites and looking for advice.
I’ve been over once before long before we had a motorhome and visited Thiepval and some Somme sites.
Want to go back, need to revisit Thiepval and want to take in more of the history, particularly the Somme sites and places to see. Looking for advice and suggestions so that I can put a loose itinerary together and have some stops in mind. I know there are some ‘must see’ places and would like suggestions for other things to visit when in and around the area, maybe war museums , even the German cemeteries .... those lads were cannon fodder too and deserve our respect and remembrance also.
Don’t really want to be in any organised ‘tour’ or anything, rather visit on our own time and spend as long as we want there. We’ve no set timeframe, it will be part of a longer period abroad and would love to hear suggestions you may have.

The island of Ireland peace park near Ypres is a must ,also La Cambe German military cemetery near Omaha beach Normandy is worth a visit although I think it may be a ww2 cemetery,As Jack already mentioned the aires/campsite in Ypres is handy to stay at for to visit Menin gate.

I’ve been 41 times to the Somme and Belgium both in the Motorhome and leading groups and one will have absolutely no difficulty finding overnight parking anywhere for a Motorhome either down at the SOMME or up in Belgium.

The Lochnagar mine south of La Boisselle is worth a visit when you are in the area

Thanks everyone...... lots of info and useful leads already from this thread I’ll make use of.
Keep them coming if you know anywhere else.

Help to understand the layout and the different countries from around the world even Portugal ,who took part in the war to protect the smaller nations of Europe from the dominance of Germany leading to World War 1 can be found at british expeditionary force world war1 on the wikipedia pages Might help to plan out tours or understanding for younger folk

Just had 4 nights in Arras. Didn’t stay on the aire but at the end of rue de la piscine by the canal. Much prettier and quieter. No services though, but you could go and use the ones at the aire. It is not far to walk into the town. And the free electric hop on hop off bus stops just on the main road which takes you into the main town. The connecting up free bus goes to the Citadelle, which we didn’t think worth doing (other than the wall to the shot, but the cemeteries are over that way. Saturday morning has a massive market across 2 1/2 of the squares. Really enjoyed 4 nights there.

We also went to Peronne, mainly as we need a campsite to do 12 days worth of laundry (twin tub on board). Whilst we were there, I visited the World War I Museum. It didn’t really tell me anything new but presented all the facts in a really clever way . For instance, the uniforms are not in glass cabinets but in graves in the ground. It equally represents all nationalities, including the Germans. All the information was also in English. Just the film is in French.

Thanks again folks, all great information.