Dude. I'm a harcore rafter.
I got friends that are real into white water rafting. The Supreme raft you are talking about is not a raft. It's an inflatable pool toy. Don't front like you need that for some outdoor shit. You just want a pool toy that says supreme on it. No shame in that, but don't try and make it something it's not.
Also why is everyone hating on the kid who just got a car? Props man. My first ride was an old beat up Honda too. Just don't put a Supreme sticker on it. Or any bumper sticker for that matter.