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.
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/...)
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.
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.