Starting from central St Anton, head west and follow signs for the Rossanaweg. The gravel path will pass under two tunnels, and then continues up the river. Follow signs for Verwallsee. The path climbs at a reasonable grade up the valley, alternating between singletrack trail and gravel paths. Eventually, you'll reach the beautiful Verwallsee. You can retrace your steps from here or complete a circuit of the lake, looping back to the Wagnerhutte (always a nice spot to stop for lunch or some refreshments). Return the way you came.