From the car park at the gorge bridge, follow the signposted path to Kerschbaumer Alm. After a rest, continue from there on the path to Kerschbaumer Törl, 2285m, up to Karlsbaderhütte. From here, descend via the Engeländer hiking trail to the Dolomitenhütte.
Alternatively, you may also leave out Karlsbaderhütte. To do this, after Kerschbaumer Törl, take the path to the left to Marcherstein, heading to Dolomitenhütte. This will save some 45 minutes of walking time.