please help with JSRF!!

[BORNGD]

i am in the ROKKAKU-DAI HEIGHTS and i am stuck! i think i have covered all the grafitti in the place, but then u get to a gate that u cant get past till u do something else (so it says) what do i have to do? is there a secret area i have to find? can anyone help? i am just skating around looking, cant find anything

[MixMasta]

u have to go to the sewers. if u know the one place where u have to grind up the pole, hit the billboard, dit another billboard, and then hit another pole and then launch off to get up to that one area, dont do that....continue scating past the pole coging where there is that wall that u have to get on top of and turn left when u reach the wall. there should be a like halfpipe, just travel right on the pipe and u ll be at the sewers