What you do is go to park editor put in one pool then go and test it get some tape and tape down y then go to pool go as fast as you can go (put a jump roll back down) then start grinding then leave it all night
When in create-a-park mode put an object (building, kicker, hp, etc.) in the park. Lower in undergruound, and if you'll notice a slight change in the squares of terrain around it. Select that object and all the boxes around it with the Cut/Copy tool, then paste it in and the terrain should be stuck in the object.
To unlock the different features, complete all goals and get gold medals in all three competitions in career with a different skater each time. Do this the indicated amount of times for the different features.
1 time: Play as Darth Maul
2 times: Play as Wolverine
3 times: Play as Officer Dick
5 times: Play as Private Carrera
6 times: Burnside level from Tony Hawk's Pro Skater
7 times: Ollie the magic bum
8 times: Play as Kelly Slater
9 times: Roswell level from Tony Hawk's Pro Skater
I found this out when I was fooling around with the cheat option I type in freakshow all one word you will end up with wolverine, ollie the magic bum, the devil woman, the neversoft eye, kelly slater, the hot chick, and the fat policeman. hope you like the cheat