If you go to Tomamu, definitely shell out the extra 4000 yen or so and take the guided 'off-piste tour' (3 are offered daily).
2 guides will take you to the left-most area of the mountain for about a 3-4 hour trip. Nice introduction to backcountry hiking. Overall it lacked fresh snow when I visted, so I'm biased there (not really interested in groomed runs). The right-most area of the resort, off of lift 4, is fairly interesting. The forests
Niseko Mountain Resort Grand Hirafu review by danz
This resort is truly a magical place.
I have ridden there 8 times this season, and have had 8 powder days. The consistency and quality of the snow that falls there is unparalleled in my opinion. The tree runs, especially strawberries, tetu's, onne, and hanazono 3 are perfect...The runs available off the peak (with a ~30min) hike are fantastic always providing deep turns on wide open, perfect pitched runs...the type of runs I dream about. Night
Niseko Mountain Resort Grand Hirafu review by Will W
Take some of the earlier reviews with a grain of salt. Don't beleive all the hype.
I think many of these people haven't skiied the powder resorts of the US and Europe. You can catch some good powder here at times but runs are short. Not to mention that everything gets ripped up by 10 or 11 AM due to the ever increasing amount of foriegners and Japanese who duck ropes. I saw westerners shoving each other in early morning