What other interesting places are there?

Hint 1 of 8:

(1) In the adult bookstore, look in the hall opposite the bathroom for a
smaller room that contains an RPG.

Hint 2 of 8:

Also, one of the shelves opens to reveal some Pipebombs.

Hint 3 of 8:

(2) If you stumble around the dark a bit after you've unlocked the door,
you'll find a hidden stash.

Hint 4 of 8:

(3) Once you've demolished the building, you can go down into the sewer by
shooting the manhole cover (which is in the debris).

Hint 5 of 8:

The only way to get out is to fly back up.

Hint 6 of 8:

(4) Also, in the stripper joint, jump on top of the couch.

Hint 7 of 8:

One of the walls where the dancers are will open, revealing some items.

Hint 8 of 8:

(5) Finally, look at the TV screen in the bar.