The track starts next
to Tekapo Springs.
If you want a serious walk take the track to the summit of Mt John that starts next to Tekapo Springs. It will take you about an hour and a half to get to the summit and it's a fairly steep track so make sure you're wearing good shoes. At the top of Mt John you'll find a cafe, observatory and viewing platform with amazing 360 degree panoramic views of the Mackenzie Basin flats, surrounding mountains and lakes.
If you're short on time or energy, you can drive to the top of Mt John and walk the summit circuit track which will take about 40mins.