El Cabron beach can be found half way up the east coast of the island; a 20 minute drive from either the south or the north. Although there's almost always a breeze here (and wind farms!) during July & August expect a lot of wind, though El Cabron has plenty of areas sheltered from any wind.
Arinaga is a great place to visit in its own right, a typically Canarian seaside town as opposed to a holiday resort. Head for the promenade and check out the restaurants there for some lovely seafood before heading off those last few minutes to El Cabron.
Even on a Sunday in August (busiest time of the year for the beaches here) there was plenty of space on the beach, as you can see above. There's a lifeguard at week-énds though not Monday, otherwise there are no services or facilities at all on this beach.
It's not the easiest to get to but you can drive along a dirt track most of the way then a 5 minute walk that last part once you reach the large, orange (navy) building that's just above the beach itself (we always park next to that building).
The beach itself is a lovely golden sand. Once down on the beach there's no rocks or pebbles. If there's a low tide then right at the beginning is a little peace of paradise as seen below.