In reply to Andrew_ing:
> we are only there for about a week at the end of april early may
Ah I thought you'd be there much later. I was going to recommend the Aiguestortes / Cavallers area (mix of bouldering, sport and trad granite) but at that time of year it'll most likely be wet and there'll still be plenty of snow around high up. I'd have thought that will be the same pretty much wherever you go in the pyrenees proper at that time though. OK if you just want walking but the climbing will be more limited. I was there in May last year and the lower sport stuff around the dam was wet. We were waist deep in snow on the approach to a route up at Travessani and everyone else was ski touring!
How about the Ariege area? I haven't been there myself yet but I believe there's plenty of single and multi-pitch sport and trad. You could mail John Arran for more info.
Alternatively I'd stick to the pre-pyrenees area (on the Spanish side but lower lying and tons of amazing climbing - it covers the likes of Riglos, Vilanova de Meia, Terradets area, Rodellar etc). Not specifically what you asked for, in that it's mainly single pitch sport or multi-pitch bolted but you're guaranteed to get some amazing climbing done.
Get a copy of this (it covers all the amazing single pitch climbing around Lleida plus multi-pitch at Terradets, Vilanova de Meia and also some of the best routes in Cavallers)
http://www.needlesports.com/Catalogue/Books-Maps-DVDs/Foreign-Climbing-Guid...
Hope this helps
Ali