You can find lonely beaches if you go to the "Vivero Dunicola Florentino Ameghino", a pines forest of 500 has., located to the south of the city, close to the pier (300 meters). The forest is in front to the sea.
To travel around Miramar, you only need a bike. Miramar is one of the cities in the world with more bikes by inhabitant. You can rent it in a lot of shops in the city. You can visit all the city in one day with a bike. And if you considered yourself an hero, try to reach Mar del Plata, only 50 kilometer...
Go and visit Mar del Sur, a little town just 15 kilometers to the south of Miramar.
You'll find this old fashioned hotel, built at the end of the XIX Century.
Probably it's not the best Miramar's feature, but you can try to catch something.
Good luck, you'll need it....
Equipment: Fishing rod and luck