The one day bus pass, 800 Yen, is only worth buying if you have problems walking and want to see the Daimon Gate as well. If you don't want to miss Oku-no-in and surrounding graveyard you have to walk 4 to 5 km, maybe another 2 to 3 km if you walk back to the cablecar station from the center (Kongobu-ji Temple etc.) or 1,5 to to if you walk back from Daimon Gate (less frequent buses, you might have to wait some time).
Fun Alternatives: Bus from the cablecar station to the last (closest to Olu-no-in) station 390 Yen, from the center to the cablecar station 290 Yen (or less depending witch station you get on), to the Daimon Gate 170 Yen (you need coins, no change given).
If you walk the hole way it will Be around 10 km walking.
Updated Apr 17, 2011
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Reviews and photos of Koyasan attractions posted by real travelers and locals. The best tips for Koyasan sightseeing.

The one day bus pass, 800 Yen, is only worth buying if you have problems walking and want to see the Daimon Gate as well. If you don't want to miss Oku-no-in...
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