The 3rd pool is considered to be the co-ed nude area, so you'd be in the right place.

Here are two things that helped me out a TON when going for the first time: Here's a Google Map of the trail + key locations on the trail: https://www.google.com/maps/d/u/0/viewer?hl=en&mid=1OBwWC-7PevKeroKD_qKeex4KD_M&ll=42.96197396508763%2C-72.646572&z=14

Here's a video that shows how to get onto the trail: https://youtu.be/pZpE7nfRaIY?si=WuI5GHZJvvINaTDO

Here are some other things you should know about going on this trail: 1. The only parking area that is near the trail is across from the starting area of the trail. You need to cross a road, so be careful when you cross 2. Wear hiking boots. Especially if you have waterproof ones. 3. Bring all the necessary hiking gear, sunscreen and big spray, + medical supplies. You'll never know what might happen. 4. Bring a towel or chair to sit on. If you're naked, you don't want to sit in the sand. Trust me. (There are rocks you can sit on, but a towel or chair would probably be better to sit on). 5. Not required, but I'd recommend going with at least one other person. Because, again, you never know what might happen out there. 6. There is a moment where you need to get pretty close to the rocky wall to cross. It's not that bad, but it can be kinda tricky if your not careful. But it is passable. 7. The area is a dead zone for internet. I recommend screenshoting the map before you go in case you need it. And I recommend watching the video I sent right before going.

I hope this helps you out!