I've always been near water (even a swimming pool would do) & I'll kick it. I also found one of those kid's punching bags in a thrift store years back, the kind with a lip you stand on to hold it in place. Throwing rocks in the river is great too. I lived near a boxing gym for a short time & they let me have a go at the punching bag there.

When I'm so-angry-I-see-red I exercise hard & it always ends up in tears then deep, deep sleep & usually I'll feel much better for a long while. The therapy, though, has gotten me beyond the anger to a large extent ... only one episode recently. Huge progress. Sure have punched out a lot of inanimate objects along the way, though