I have traveled about 70 per cent of the road, but not between El Leoncito and Uspallata. In any case, the scenery is beautiful on both sides, so you can only expect more beautiful sceneries... Calingasta is North of Uspallata, and therefore going towards Uspallata the Andes will always be on the right-hand side. Keep this in mind because since you will be travelling on a bus you should get a seat in the right-hand side when travelling from Barreal to Uspallata. And if you are coming from Uspallata to Barreal, on the right-hand side.
Getting from Calingasta to Barreal is no problem, since the traffic vans normally have empty seats because passengers coming from San Juan get off at Calingas
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I have traveled about 70 per cent of the road, but not between El Leoncito and Uspallata. In any case, the scenery is beautiful on both sides, so you can only expect more beautiful sceneries... Calingasta is North of Uspallata, and therefore going towards Uspallata the Andes will always be on the right-hand side. Keep this in mind because since you will be travelling on a bus you should get a seat in the right-hand side when travelling from Barreal to Uspallata. And if you are coming from Uspallata to Barreal, on the right-hand side.
Getting from Calingasta to Barreal is no problem, since the traffic vans normally have empty seats because passengers coming from San Juan get off at Calingasta. I am not acquainted with how much demand the bus service from Barreal to Uspallata has, because I have not made this trip. If you need reservations from Uspallata to Mendoza or up to Las Cuevas (the Aconcagua area) call Expreso Uspallata at this phone number (54 261) 4307676. The cover all the villages between the international border with Chile (Las Cuevas), including Penitentes ski center, Polvaredas (the mini museum), Puente del Inca (thermal baths), Uspallata, Potrerillos, and Mendoza. By the way, you might want to stay over at Uspallata, there is a very nice inexpensive hotel. Check this site (Gran Hotel Uspallata, 3 stars) www.atahoteleria.com.ar/uspallata/english/hotel.html. If you take your tours to Alta Montaña (high mountains) from this hotel, you are saving 75 miles of travel each way.
The road is beautiful; you see the Andes all during the whole trip, always on the right-hand side far beyond Uspallata going towards Mendoza. Once you arrive at Potrerillos, you will start bordering the Potrerillos lake, this time on the left-hand side. So if you can get a seat on the front row, far better... In any case, you will only see the lake at a few scenic points, while the Andes will accompany you nearly all the way, so the choice it clear. If you decide to stay in Mendoza (I would, it is a beautiful city), the tours suggested from there are: 1) City tour, or a taxi ride to the General San Martin Park and Chacras de Coria. 2) The wine tour, visiting wineries and vineyards. Both are half-day tours. 3) Alta Montaña (up to Las Cuevas or the Aconcagua Provincial park, depending on whether there is ice on the road or not. Both alternatives are just fantastic. 4) Cañón del Atuel (Atuel Canyon), a very nice tour to the Nihuil dam and lake, the Atuel Canyon, the rafting area of Valle Grande, with time to take a one-hour rafting tour down the river, lunch at the Valle Grande Hotel and Resort, and then visiting a vineyard and winery at Rama Caída, near San Rafael. 5) Las Leñas: The tour I recommend leaves only on Friday night and arrives back on Saturday night. It will allow you to visit Las Leñas for 27 dollars, with some ten hours over there to walk the village and ski center. The bus remains open for passengers to rest whenever they wish. It is sold by Andesmar Turismo and you can buy it at Estacion Sol (a travel agency) located inside the Mendoza bus station.
Remember that there are direct buses from Mendoza to San Luis, Córdoba, Mar del Plata, and Bariloche. Andesmar covers all these services, but is not the only bus company that provides them. Their website is www.andesmar.com.ar. They feature premium bed, standard bed, and semi bed services. The premium bus services have seats that lie down completely flat, with DVD and MP3, your choice of chicken, meat or vegetables for dinner, plus wine, whisky and champagne, all complementary. Argentina has been a bargain for foreign tourists for the past four years, although prices in dollars have doubled over this period. So don't wait too long, or it might no longer be a bargain. Enjoy your trip.
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