Hi,
Last august whilst on holiday in france we stayed at Sequoia Park,near to Royan, and whilst we were there we had a day trip down to lac sanguinet to find a nice site for this summer. I spent many childhood holidays at this lake with very fond memories and wanted to return this year with our 5 year old daughter so she have the enjoyment of it.
Its a fantastic lake, very safe for children, with fine golden sand beaches. The surrounding area is very flat apart from the sand dunes, and the area is basically covered in a pine tree forest. The lake is also great for water sports. I would highly recomend this part of france. Oh and i cant remember what Les Grands Pins was like but we chose to stay at La Rive on a fully serviced pitch, it even has its own private beach. We are Staying for 15 nights in early august.
Hope this helps,
Darren