There are only 6 or so lodges scattered around the lake so you never feel crowded. The tariffs aren't cheap, but there's lots included, like unlimited access to mountain bikes, pedalos and rowboats. My son learned to row like a pro during the course of one weekend.
There's crazy golf, all manner of ducks and other fowl, kids' den with pool table, play area, and more besides. And if you ask, the gamekeeper will bob round with kindling, firelighters and marshmallows for use with your firepit/chimenea!
Some activitites (fishing, clay pigeon shooting) cost extra.
The acommodation has a "wow" factor. The children (11 and 14) loved it, especially those little touches like guitars, and the big touches like having our own boat and jetty. (Not sure if all lodges have this; a couple are right next to the main jetty anyway.)
I'm glad we splashed out (no pun intended) on the treehouse, a great idea for a special occasion, although if it was just a weekend away for the hell of it I think I'd be happy with any of the lodges. That said, nothing says "getting away from it all" like being woken by the (very) gentle shaking of your treehouse as your child/teen runs across the rope bridge.
When we go again, we'll explore the surrounding villages a bit more - it looked as if there were some very nice cafes and country pubs to try, and walks to enjoy, but we just didn't have time to do everything in one stay.