Rapid City, SD -- West Side (Can't remember name)

One the nicest dog parks i've ever been to. It has a nice creek that runs through it, plenty of room and there are always 20-20 people there with their pets. I went there 5 years with my standard poodle and never had a problem.
People get chased off farily quickly if they have an agressive dog or bad habits, it's kept up very well.

There are no fences, but it's out of town a little bit. Hilly area with mature trees and plenty of shade/water.