We are staying at Loon Lake at the moment. The place is FULL of kids, all with smiles and having a ball. We're on our own so it's a bit noisier than we would prefer, but if our kids were young it would be terrific.
They aren't good about enforcing the Quiet Time after 10 o'clock. There was a loud (and profane) party going on until 1:30 a.m. one night, as well as a few fights; just yelling, no blood.
Campsites are pretty good although close together and very open, so not much privacy. The lake is lovely but full of power boats so, again, it can be noisy at times. The staff at the Loon Lake Lodge has been very nice and helpful. Since it's inland, it can get hot during the day but that makes the lake a nice place for a swim.