Although Low Wray looks perfect on paper, its actually far from it. I can confiirm that the wardens are seriously strict about powered craft. We had freinds staying there a few years ago so we took our boat up to meet them.
The picture shows how far out we had to anchor to keep the onsite and on water wardens off our backs, but at least the kids enjoyed playing taxi in the tender for the weekend
FWIW, I dont think there are any bylaws that stopped us anchoring closer in, but we wanted to keep the peace.They were not actually allowed to land the sib either (4 hp engine) but we could wade out to it. The other issue with Windermere for a one off visit is the cost of registration and numbers, fine over a year, but expensive for a single visit.
As most people have mentioned, Ullswater is a much better option, there are 2 campsites on the water. Park Foot (ask for Aikbeck Field) is the more commercial of the 2 and Waterside House still being a working farm.