Timberline Lodge also has park features all summer long on the Magic Mile and Palmer chairs, including a half pipe. They also rent out space off Palmer to private snowboard/ski camps (e.g., Windell's) that have BIG features. You can purchase passes to the private parks (at least for the Windell's park). It is easy to find vids of the Windell's summer park on YouTube. It is routine to see top tier pros at Timberline in the summer.