Robert Ridge offers a high route to Lake and Mount Angelus at the tip of the Travers Range.
Drive west along SH63 from St Arnaud and turn left on to West Bay Road. Follow it for 5km, crossing the Buller River and climbing to the upper Mt Robert car park. Walking time from here to Angelus Hut (36 bunks, serviced) is 5-8 hours. The NZ Mountain Safety Council has produced a video on the route which can be found here: https://www.youtube.com/watch?v=sg5BAkJwvMg
The route to Angelus Hut along Robert Ridge is a superb ski tour but beware of avalanches on the two sidles. A more sheltered access is via the track to Speargrass Hut (12 bunks, serviced) and then a poled route to Robert Ridge, or via the Cascade Track up Hukere Stream (beware of ice here in winter). Allow 5-7 hours for either option (less if you take the water taxi for the latter).