Here! This is our facebook page for find a third/be a third in MN:
https://www.facebook.com/groups/1489747947910632/
Welcome to the crew! Some of us (myself and a few others) have dispersed to college for the year but I'm sure you can still find plenty of other riders. As for the cable park, absolutely give it a go. I worked there all summer and its a blast hanging out with everyone up there. We're usually open weekends but as I'm not home anymore I would get on the website and check the calendar at visionwakepark.com