The fastest route is motorway A22 across Brenner pass. Take exit Brixen/Bruneck and proceed towards "Pustertal" (Puster valley) until Bruneck.
Follow the traffic signs towards Ahrntal.
Stay on the main road until Sand in Taufers. About 2 km after the exit from Sand in Taufers you have arrived at the ski resort and hiking area Speikboden.
If you're coming from Innichen/San Candido (e.g. Tauernautobahn), take the "Bruneck Ost" (Bruneck east) exit. Follow the traffic signs towards Ahrntal. Stay on the main road until Sand in Taufers - Speikboden.