Visit the salt caves
Hallstatt salt worlds (http://www.salzwelten.at) will take you into the more than 250 year old salt mines to explore its underground beauty.
Hiking
There are many hiking trails in the mountains behind hallstatt and throughout the salzkammergut area. ask at the tourist information office for a good hiking map as it can be easy to get lost in the rapidly changing alpine weather.
Do an outing by boat
Take a tour on the lake of hallstatt with hallstã¤ttersee-schifffahrt hemetsberger. tel 6134/8228, (http://www.hallstatt.net/...)
Children
There is a very nice lakeside playground about 500m south of town with free wc, swimming, sunbathing, and the best views of town you'll see without going on a boat.