Group holiday Belgium

[nearlyveryold]

I'm looking for inspiration for large group holiday for family. Age range from 3yrs up to 80yrs. Ideally booking individual cottages / gites/ lodges but some shared space for everyone to get together. Could be as many as 50 of us if everyone decides to come.
I need to consider these things:
Easy to travel to by ferry - the reason I thought Belgium as easiest to get to from ferry ports? Don't want too long a drive. But happy for other suggestions.
Outside pool
Self catering but restaurants nearby
Different accommodation price options would be good as some may want luxury and others more basic
Child friendly
Attractions nearby for days out
Any suggestions gratefully received.
Thank you

Look at landal green parks
https://www.landal.com/

we’ve just returned from one of their parks in Netherlands which was great but I notice they have some sites in Belgium. It was great!

you might have more options if you consider France though, not quite sure why you have prioritised Belgium over France.

btw Netherlands was amazing if you would be ok to travel a bit further.

@StillWantingADog - thank you. I'll check this out. I'm not sure why I've prioritised Belgium either - just thought the drive would be easier 🙄
(And, I also still want a dog) 😀

m.sunparks.com/gb-en?gad=1&gclid=Cj0KCQjwqNqkBhDlARIsAFaxvwwB4P80EpC74ojYNA0TyyOtMk6pkmm6-UwumrFSL8rLAgMr0lRG-v0aAn59EALw_wcB&gclsrc=aw.ds we've stayed in two of these before. Would definitely recommend!

We've just been on the train from Brussels to Ghent which continued to Ostend. Just mentioning how great the train system was in case you gave anyone who doesn't drive.

https://en.ardennes-etape.be/ also do some large places - castles, villages etc. Also look at Roompot.com. Landal are great (as mentioned by pp)
When do you plan to travel?

https://www.pierreetvacances.com/gb-en/search?facet%5BFREESEARCH%5D%5Bquery%5D=&facet%5BCOUNTRYREGION%5D%5B%5D=l2_19&original_keyword=&facet%5BFREESEARCH%5D%5Blat%5D=&facet%5BFREESEARCH%5D%5Blon%5D=&UXfreesearch=%C2%A0North+Picardy&facet%5BDATE%5D=&facet%5BDATEEND%5D=&facet%5BPARTICIPANTSPV%5D%5Badult%5D=2&facet%5BPARTICIPANTSPV%5D%5Bchild%5D=0&facet%5BPARTICIPANTSPV%5D%5Bbaby%5D=0&dateuser=0&option%5Bbf%5D=1&tracking=1&perso=0 Pierre et Vacances also have villages in Northern France

@MissAmbrosia thank you. We are looking at half term next May.

Ah we’ve also been to pierre & vacances (in the south of france). A good option.