I know this is specifically what you said you didn't want, but Eurocamp have some nice sites near lake Garda. We used to go there as kids and have more recently started going to the Eurocamps in France. I've found them like a more relaxed version of Centre Parc. We have recently only stayed in the cabins (not the tents, although we used to as kids). Might be something to consider if you can't find anything fitting your exact brief x