Artifact DIY Skate Spot Video/ DIY Brainerd?

Check out these clips of DIY skateboarding.  I wonder if there are any vacant lots in Brainerd that would work for a ghetto skate spot like the one in the video above. What would be the legality of having some homemade bank ramps and quarter pipes at the location of the old skateboard park at the Jaycee's Park in Brainerd.   It would be nice to have a place to skate and have sessions under lights during the summer, and maybe do a little concrete pouring like they have done in Duluth.  Check out the DIY Duluth page.