Where do you park. I got there, GPS said my destination was on the right and i could not see anything but grass and rocks? Is it across from the Tides? Where can you park?

You have to park at tides and walk down and across the street theres no parking only residential

+1 on parking at Tides. Or you can park at the main Nahant beach on the other side and walk to the dog beach. It's not a short walk but it's doable. The only other option is risking a random parking spot somewhere in Nahant, but getting towed is definitely a possibility. Or you could park in Lynn and get an Uber to the beach.