Kc couple is correct. Usually is more sand in spring and summer at Cupecoy. As for parking, yes there is a 5 dollar parking charge and of course Dany and his food and drinks. For those who wish to park for free, you can; depending on which direction you are coming from, park right after passing the Sapphire go off the road and bear left where I forget the name of the small hotel next to Sapphire is and park for free. You just have to walk about a 300 yards before you see Dani's set up. You will pass the baby beaches which are C/O to your left. There are stairs available to get there. Right past Dani is the big C/O beach. We were there in December and no sand. We sat on the rocks. Coming in from the French side, pass the Blue mall and as the road bears right, turn hard right off the road and into the lot for your free parking.
A nice alternative though no amenities is Baie Rouge. Go west for about 100 yards and you can go nude. Sad thing is though on Rouge the villas have been ravaged by the storm with no sign of being re-built. Hence the issues on the French side. You can see my previous post from December of the state the villas are in. A real shame!