In reply to diddler:
Fantastic place! Fingers crossed the weather is good for you. The hiking there is fantastic and the trails are well maintained. The best trails start at the bottom end of the town and a local map which you can pick up one you are there will give you many options. My girl friend and I did a nice two day hike which on day one lead us up to a nice lake with a good view up to Fitzroy ( good camp spot belw the steep climb to the lake) the next day was across to the next valley up to another lake which gives great views of cerro torre. Climbing wise I did nothing in the high mountains but soled a large route on the cliffs that over look the town. I had no info on grades etc but there is plenty of rock to be climbed I seem to remember passing some bolts so it must be documented somewhere. There is some bouldering in el chalten with good landings the boulders are quite obvious to find and should keep you interested. Hope this helps in some way. Enjoy