In January, my cousin and I took an easy 4 hour hike to the Frey mountain shelter. It was a beautiful day, the horseflies kept to themselves for the most part, and we were rewarded with stunning views of lake Gutierrez, condors circling gracefully, effortlessly high above, the many peaks of Cerro Catedral, and, at the top, the majestic spires surronding scenic lake Toncek.
We hiked this in an afternoon, but you can spend the night at the shelter and take side trips from there. For more information on this and other shelters, visit Club Andino Bariloche and go to the Refugios y Campings page. There you will find information in Spanish and English.