We visited in early September 2019 about mid-day and it was not crowded at all. First off to get there from Sorrento you should drive, the walk from town is really busy with cars and scooters, and then you eventually run out of sidewalk. Best to do 10 minute car ride, then walk the path (which has a good grade on cobblestone then turns to dirty and not very well maintained), running shoes or good walking sandals would be best shoes for this trek. There are ruins at the bottom of the path, as well as a short boardwalk to a beach club which costs 5 euro for a day bed. The bagni water is amazingly clear and a bit cooler than the sea, once you swim out to the sea through the arch the water is warmer, you can then climb up and jump from the cliffs. Only drawback we found was when a tour boat arrives and lets people get on their kayaks and come into the bagni. It’s just too small for boats and swimmers combined, kind of spoils the quiet splendid experience.There is no bathroom facility so please be courteous and whatever you bring take back with you, the world is our playground so lets keep it clean.
Overall great experience, plan about 3 hours in total for a swim and explore. Note: If the gate is open to the farm about ½ way down the cobblestone path, photo opportunity of lemon trees and vineyard.