All the parking in Lund is now owned by the hotel. You need to register with them. Not sure what it costs now. Do NOT leave your car by the side of the road without a sticker on it. Towing is mighty expensive and does happen.
There are tent pads and biffies on some of the islands
You may have to book with BC Parks – either for individual sites or at least for a back country camping permit which used to be $5 a day.