Yo
First of all, I haven't sent my application away either yet so chillax
Okay you can name the hospitals if you like but if you have experience at more than one you could be eating into your already limited number of characters. Think, is the name of the hospital essential? If not then you can get away with not putting it in.
Hobbies and interests isn't that big on my statement. I said all the necessary things..... hobbies are blah blah, was head boy, student rep at uni and vice president of a student society. Of course I put it better than that lol!
And finally you can put individual cases down if you wish but only if you can explain why you think its important and most importantly what you learnt from it. That is the key to the statement; write what you got from it. Someone could write down an impressive list of cases they saw however, if they dont say what they learnt then it's worthless basically.
Good luck with your application and I hope this helps you.
D