1-Point Pelee Park depending on the day almost anybeach as long as you are careful
2- Rondeau Park near tip
3- Pierce Prov Park--good
4- Big Bend Consevation area
5- Port Stanley - go far to the east of the last parking lot
6- Long Point
7- Pinery Park --northern beach areas but be discreet
8-Point Farms same as above
9- Giant Earthworks Historic site
And many other consevation areas that don't see many visitors. I have sunned with my wife at many places and hiked as well but be carefuland dare to bare!
I spent some private nude time on Point Pelee's east beach last summer. My regular spot has always been the north beach at Hillman Marsh but it has been blocked off due to high water levels. I finally got to Port Burwell, the public nude beach past the boundary of the provincial park. It was awesome to be there, very busy, warm day and totally free. Looking forward to going back this summer.