sounds like he's just having fun. Just leash him and don't let him destroy things. If he ignores you you aren't managing it well and I wouldn't have him off leash until he obeys your leave it or recall to get away from the stuff. A lot of dogs find the hose/sprinklers really fun, mine goes nuts too, but if she gets carried away when it's game over I call her off and if she tried to ignore me I'd leash her.
On the plus side it's an awesome way to tire them out
I ask mine "wanna play hose" and then she knows she's allowed to go nuts: