We'd been a bit disappointed with some of the beaches on the Amalfi coast, but this is a brilliant find and well worth the extra effort to get to. From the pier at Positano, a range of small boats come to transport visitors to various local beaches / hotels, and one of these will take you to Bagni d'Arienzo (clearly signed as such on the mast pole). The boat runs between about 10am and 1pm and takes a little under ten minutes to make the short trip. The boat only takes about ten people, so you may not get on first time, but it's pretty quick to come back. The boat is free, but once at the beach you need to pay to hire a sun-lounger for EUR10. There is a free beech there that you can get to by walking down steps from the road above. Getting back to nature in South Wales or Northumberland this is not - there's little spare beach space beyond the sun-loungers, and you have a constant accompaniment of music from the bar, but the sea is warm and crystal clear - you can swim in it for hours, and for comfort / convenience the whole experience can't be beaten! It's a real benefit that the bar serves excellent food for lunch. All the people working there are very friendly and make you feel completely at home. My advice would be to go for the full Med beach experience and be prepared to spend around EUR30-40 per head to get you: a sun lounger, hiring a towel to avoid lugging one around, and a delicious lunch at Bar d'Arienze at the back of the beach. There are also toilet / shower facilities.
In our experience the beach didn't get too busy (this was last week of August) but for complete peace of mind you can book sun-loungers and lunch the day before by emailing firstname.lastname@example.org.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.