sposed to be going on the Wye in September ,near iron bridge for a 3 day paddle , don't think its that visually stunning though . The national white water canoe place in Wales near Bala I think is pretty busy all the time , grade 4 at the top 2 sections , sank our canadian in seconds ....
but it not the algarve to look at , but you are in Snowdonia if thats any help
Si Oli
this place looks even more dramatic though
http://www.verticaldescents.com/extreme ... tAodaHcA9w
whats your time frame ?
Si