Skiing on the extensive Dachstein West Ski Region - 140km of Intermediate Piste + the Krippenstein Freeride Arena, for those looking for an exilhorating off-piste experience (http://www.dachstein.at/)
Swimming in the lakes
Mountain Hiking
Walking on the Gmunder Promenade
Visit Hallstatt a UNESCO World Heritage site, a stunningly beautiful village.
The Dachstein Ice Caves at Obertraun, are well worth a visit. From from 1st June until 30th September 2012, travelers can buy a UNESCO World Heritage ticket (http://www.dachstein-salz...) which costs 31 Euro and can be used for the ice cave and a boat trip across the Lake Hallstatt.
Mountain Bike, there are many trails for all levels of biker with stunning scenery around every corner.
The Krippenstein is a stunning paragliding site, rising 1500m from the valley floor.