Yup, spent a while doing this yesterday, dropping into Regs from the top there. You can hit that QP in the corner but it looks pretty stupid. Nice to be able to get up there though. You can even grind the thing that goes over the top of Regs, with the boards in it. God knows why they made that possible though.
This is definitely the bestr DLC yet, IMO, but I'm kind of bummed to hear it's the last one (or at least, that's what it said when I completed all the challenges).
Would have liked more parks like Maraffa.