|check out the Engelhorner/Rosenlaui area. There's a few different areas there, but generally the limestone is very good quality for rock in the freeze/thaw zone. It's not that far from Eldorado. Bag loads of other really good stuff in that valley also. I've climbed in that valley many times over the various trips I've done, and I'll always go back there. It's great.
There is a series of guide books called Schweiz Extrem and Schweiz Plaisir. There are several of each for all of Switzerland.
Go to the camp ground/pizza bar at Gadman and talk to the guy (Tall, solid looking guy) who runs it, he knows a lot about the climbing there. There's climbing across the road which is very spectacular (Telistock (not sure of the spelling of that one) and Wendenstock), but not as good rock as Englehorner. Also the routes tend to be run out, steep and loose, more so towards the right hand end near the glacier. Very exciting. The guy in the pizza shop will know if they've been re-equipped. You'll need trad gear on all of these routes.