After an interesting and intensive Spanish lessons week, one of the daily trekks you could do is going to Frey. There are different options to arrive to the refugio.
One is from the base of Cerro Catedral. Public transport goes to Cerro Catedral(Bus no. Catedral). You can start walking from the ski resort following the small sings that bring you into the path. It is a very well marked path with excellent wooden and metal bridges. After a while walking, you will pass the Refugio Piedritas (a small shelter) before coming out above the tree line for the final kilometer to Refugio Frey. The walk usually takes between three and four hours.
The second option is doing Frey for the ridge or going from Lago Gutiérrez which will take you longer but from where you will enjoy a paceful walk close to the lake. Public transport goes to Los Cohiues (Bus no. 50).