Lower Castle is the tail end of Castle, just after it bisects Sugar and Spice.
Be careful when cutting from Castle onto Lower Castle as you'll be treading the needle between beginners.
The cat track drop off can be jumped if you use a spotter to stand and spot the blind landing.
Often features bumps, so can be a good place to have your first try at a few.
Leads back onto Sugar and Spice, so be sure to carry speed to make it back to Grand View Express without walking.