What's the best park for kids in Arvada?

There are lots of great parks in Arvada, depending on which part of town you live. I live in Ralston Valley and my kids used to spend many hours at Ralston Valley Park on about 69th and Coors. There's a great little play ground, a huge grass area to throw a football or baseball, the creek runs through there and they would wade in the creek and find crawdads. We've also done family picnics there with the picnic tables and grills.