Walk up one way and return on a different one for climbing Mt. Tai.

Of course, you can hike up from the Tianzhu Peak Route and then come down through the East Route.

If you take a taxi from the train station to the entrance fo Tianzhu peak, the taxi fare is around 35 to 40RMB. I think you can use the local public bus to reach your destination. From the train station, you can walk to the Shiwei Dangxiao Station where you can take the local bus line K3 to Tianwaicun Station. Then change to local bus line 19 to reach its terminal at Tianzhu Peak Scenic Spot Station.