There are number of estancias around or in the National Park Los Glacares where you can sample ranch life. All but one of the following estancias have their own websites which you can check for further details - just click on the link:

Hosteria Alta Vista west of El Calafate is set within the land of the largest estancia in the area, the 74,000 hectare Estancia Anita. Tel: +54 (0) 2902 491247.
El Galpon del Glaciar overlooks Lago Argentina and runs a variety of excursions. Tel: +54 (0) 2902 491793.
Estancia Bahia Tunel is on the shores of Lago Viedma. Tel: +54 (0) 290 249 3043.
Estancia Cristina affords spectacular views of the Upsala glacier. Tel: +54 (0) 2902 491133.
Estancia Eolo west of El Calafate has fabulous viewss.
Estancia Helsingfors is in a remote and beautiful location on Lago Viedma. Tel: +54 (0) 296 642 0719.
Estancia Los Notros has fantastic views of the Perito Moreno glacier. Tel: +54 (0) 11 4814 3934.
Estancia Nibepo Aike is a lovely old farmhouse south of Lago Roca, some 60 km from El Calafate. Tel: +54 (0) 296 642 2626.
Estancia Rincon Chico on the banks of the Rio Santa Cruz is a typical Patagonian ranch between Fitzroy and the Perito Moreno glacier. Tel: +54 (0) 290 249 1965.
Estancias Santa Cruz, run by a group of estancias, has an office on Avenida Libertador 1215 has further details and can take reservations. Tel: +54 (0) 290 2492858 or in Buenos Aires Tel: +54 (0) 11 4325 3098.