It sounds like you've already made up your mind and are just looking for people to tell you "go get 'em champ". This is a bit of a recurring theme with some of your posts. People are not being passive aggressive, but most of us are senior medical students and our experiences do count for something. Presumably that's why you've made this thread. If you're not going to take it on board, why ask?
I would agree with the general consensus that it won't be a particularly effective use of your time. I would never fault your enthusiasm and indeed, in my first clinical year, I would regularly go down to A&E/MAU and clerk patients without being told (I want to go into EM, so I'm also keen on new experiences and getting stuck in).
HOWEVER, this was only on days when I'd come in and there was nothing happening on my actual ward or teaching had been cancelled or something. There was no way in hell I'd go in during the holidays or the weekends or whatever to spend extra time in the ED like one of our gunners likes to do. That's mental - there's a time and a place for everything.
I would also add that I was in clinical years so I'd already gained the necessary pre-clinical knowledge and skills in history taking and examination. It was also a good opportunity to practice doing bloods and cannulas - something no first year would ever be allowed to do. Neither would you be allowed to participate in the ward round, clerk patients, do the paperwork for the juniors or any of the other things which clinical students are encouraged to do on placement. So what are you getting from it?
In summary, I don't see what you will gain from the placement, either from an educational perspective (how much cardiovascular anatomy/physiology/pharmacology etc will you really know after a term of pre-clinical medicine? Let alone the clinical stuff) or from a careers perspective. It won't do you any harm (apart from using up your time off) but neither will it give you a leg up a decade down the line when you're applying to surgical specialty training.