Family of four incl 11 and 12yr olds (fairly mature in terms of sightseeing/not complaining etc). We live in the Midlands.
We usually go self-catering somewhere in Normandy/Brittany (with the car, via ferry) but fancy something different. My husband likes the sound of public transport so am thinking maybe Eurostar to Lille for a few nights and then combine with a Eurocamp-type place more rurally for some relaxation and pool time. We'd need to get to it by train/bus though. We've been to Berny-Riviere - that's the sort of place I'm thinking of.
Another option was Eurostar to Rotterdam and a similar plan - city then elsewhere for contrast. I'm also looking at the Belgian coast (De Haan?) and maybe a couple of nights in Bruges.
I like the look of Luxembourg but I don't know if it's too far south/will just entail too much travelling. We'll probably take 10-12 days in total.
We're not super fussy about accomm - happy with cheap and cheerful, and lodge tents/cabins/statics at a holiday park.
Any other ideas I've missed, or bits of wisdom please?