What should I take to hospital for my old friend?

First contact the hospital to see if he's on any restrictions. If he's in an ICU he's probably not allowed gifts at all. There also might be food restrictions. Flowers are usually allowed on non acute wards. Another idea is a stuffed animal or something cute and comforting.

A juke box might be rather large! Some hospitals don't allow flowers as they use oxygen, so call them and ask. Fruit is good; grapes are traditional. Or sweets/candy.