Might not be what you're after but Crieff hydro is excellent. They have a brilliant childrens care facility, it's run like a proper nursery rather than a kids club. And there's plenty for the 8 year old tondo aswell, horse riding, swimming etc. Can be v pricey in school holidayzs, but even the smallest lodges are fine for 5, me and my sister went with 4 kids between us and stayed in a 'cosy cabin' and it was great! X