El Doradillo is the place that can make a Puerto Madryn trip feel miraculous. From June to December, southern right whales use the deep water close to shore, and at the right tide you may see them rolling, breathing, and nursing calves just offshore.
The beach itself is simple and exposed, with little shelter from wind. Check tide and whale reports before going, bring warm layers even on a clear day, and resist the temptation to rush: the best sightings often come after half an hour of quiet watching.