Not very know riding spots.
Philipsburg-
White Sands- One of the states best riding spots. You just turn into Philipsburg and go up the Granite Ghost Town Road. When going up road never there will be sign that says Granite Ghost Town. Go up road left of sign. Keep following road untill you reach a gravel pit. From there you unload your bikes. Climb up the bank on the right side up onto the road and follow it. The road goes up a hill and down a hill. You will see some old buildings. From there you can look down to the left and see the white sand. YOU ARE HERE! Turn off road and go down into sand. Be Cautious wile riding there. The sand is recommended for 65cc bikes and up only! If you go the way i just told you, then you will be at the upper part of the White Sands. You can access the lower part by using a trail at the far side of the upper sector by the trees. When going down the trail you will come to a forking in it. Stay to the right and keep going downhill. You will come out on more sand, if you wanna you can go over to edge and go down the climb spots. Or you can look to the left and get down that way.
The Lower part consists of big climbs. 100% sand.
The  Upper part consists of climbs, jumps and good places to do rainbows.
THIS IS REAL SAND! NOT JUST THE NAME! THIS IS A UNIQUE PLACE!!