What other interesting places are there?

(1) After you jump down the roof, hop on top of the box.  On the ledge to the
right is an RPG.

(2) If you go on the ledge on the building, you can go through a window that
leads to some goodies.

Look behind the poster in that room for some steroids.

In the same room, head out on the ledge for an Atomic Health.

(3) There's an alternate way to get into the theater.

Go to the ticket booth, and shoot through the window to hit the crack on the
other side.

(4) Near the cinema sign, there's a window that you can jump into.

It's right on the ledge by the movie marquee.

You'll need to either jump on the tree or use a jetpack to reach it.

(5) Once you raise the curtain in the projection room, shoot the crack in the
movie screen.

There's some more good stuff behind the crack..

(6) There's a passageway between the bathroom and the projection booth via a
vent above one of the stalls.

Use the cash register at the candy counter to reveal another secret room
(there is a lift hidden nearby).