Of all the beaches close to Hydra Town, we enjoyed this the most because they have an area on the beach that has sand access into the water. All of the others either had pebbles or there is one close by with rocks with ladder access into the water. Walking to Mandhraki took us about 45 minutes, so we opted for a water taxi costing 3euros each, one way, which only takes about 10 minutes. There are umbrellas with two lounges for 5 euros and also some daybeds (don't know the cost of those). The sand beach is on the bar/restaurant side with music on the loudspeaker. There is also a pebble/rock beach on the other side where you do not hear the music, but is still extremely close to the bar/restaurant.
If you own or manage Mandhraki Beach, register now for free tools to enhance your listing, attract new reviews, and respond to reviewers.