We've stayed in Jard on Oceano for the last six years with the kids. Kids love it and have the freedom off the site pretty much all the time. Never really had a problem with noise, but then most of the tour operator accomadation are situated away from the bar. Bars good fun in the evening, our two are normally around and about with other kids playing or taking part in the campsite entertainment.Perhaps we've been lucky but never had problems with violence or fighting as described in one of the reviews on here. Jard itself is a lovely town, great walks through the town and down to the port in the evening. Everything is nearby the campsite so don't really use the car too much, ate at the Atlantique a couple of times at the port, can recommend as welcomes kids as well. Campsites clean and tidy and floral displays around the site and pool, which i think is a nice touch!
Puy du fou well worth a trip for the day as well, our two loved it (14 & 8) as is Les Sables D'Olonne