Where are some other groovy places?

Hint 1 of 6:

(1) Check the compartment at the rooftop where you start for a much-needed
Devastator.

Hint 2 of 6:

(2) Explore the pools in the area, too.

Hint 3 of 6:

(3) Check behind the Exotica poster for a Shrinker.

Hint 4 of 6:

(4) Also look behind the chalkboard with the bloody handprint for something,

Hint 5 of 6:

(5) Go into the karoake area of the bar for a weapon or two.

Hint 6 of 6:

(6) There's a secret passage in the dining area (near where the plates are
floating around the water) that is activated by pressing the bloody hand.