You can grind round the rails in Hollow Bastion but the quicker (and I think easier) method is to do the Halloween Town skating challenge by talking to Lock on Yuletide Hill. It’s timed but easy to get within the limit.
You jump straight across from the start point to the top of the middle present chute and you’ll hover there if you can keep your balance with the analogue stick pressed towards the wall. Mash
over and over and you’ll reach 5000 before time runs out.