We're going to the Netherlands for about 10 days this August. Kids 9 & 12. I've already planned the beginning (3-4 days staying in Haarlem, with day trips to Amsterdam and the beach. Then the last 3ish days in Efteling.
For the middle bit, I'd like to be somewhere picturesque, more rural, where we can go on gentle cycle rides, explore, maybe a castle or sculpture park, maybe a pretty town, windmills! Staying somewhere with a pool (probably indoor) for the kids. ChatGPT has thrown up various suggestions, but none of them are grabbing me. Any ideas or places you've been and loved?
Kids are at that awkward in between age where they're too old for playgrounds, but too young (at least mine are) for super adventurous activities (they're both quite anxious and cautious - so don't like stuff like zip-lines or caves). They do love swimming.
I also realise that the weather might not be brilliant, so need somewhere that has indoor and outdoor options.