For the shortest complete walk, try Treseburg’s Burgrundweg, Terrainkurweg 11: roughly 2 km from the church back to the church. It crosses the Bode and climbs through oak woodland to the old castle site and memorial. The steep ascent and descent make this a small hike rather than an easy riverside stroll.
For a half-day with older, steady-footed children, the 5.1 km Rundweg um den Höhlenort Rübeland starts and finishes at Parkplatz Mühlental. Hoher Kleef and Schornsteinberg give different views over the village; bring a Harzer Wandernadel booklet for stamps 88 and 89. Narrow paths, road and rail crossings, and the steep climb above the Bodeperle pool need attention. This circuit is unsuitable for pushchairs.
For a longer forest day, choose the 11.31 km Waldhofmännchen circuit from Alexisbad station. The wooden characters and Waldhof Silberhütte’s play and learning areas give the walk a purpose beyond reaching the finish. There are climbs and a steep, partly stepped descent. The shorter published trail is 3.74 km one way from Alexisbad’s town exit to the Waldhof, not a station-to-station circuit: a rail return needs a suitable train and extra walking to both stations.
Meisdorf offers another story-led introduction at the Annenbrücke, where Josephine and Konrad welcome visitors to the Selketal nature trail. Explore a manageable section and retrace it. The entire trail to Selkemühle is 9.59 km each way, about 19.2 km if you walk back, so all 36 stations are a substantial day rather than a short children’s loop.
For the famous gorge views, make a separate stop in Thale. The chairlift goes to Roßtrappe; the cable car goes to Hexentanzplatz, on the other side of the valley. Return by the same lift if you want to avoid a long descent on foot. In Rübeland, a booked Hermannshöhle tour adds around 50 minutes underground among cave formations and the crystal chamber.