"Between the trees"

I researched free campsites on Reddit. There were some users that mentioned "park between the trees". It wasn't until I got here that I knew what it meant. There's several pulloffs next to the main road along the shoreline with trees hovering over the sand. Many people park overnight. I didn't have any issues. A local did gave a tip, just in case there is an issue. He said to just have a fishing pole in case. Apparently anyone is allowed to park if they are fishing at any time of the night.