COOL EASTER EGGS

Also, there are several pools on the island where Diaz's mansion used to
be, but which becomes yours eventually in the middle of the game (denoted
on the map by a giant "V" or "D" depending on where you are in the game)
where you can see a pool shaped like a woman's "bikini top and bottom"
from the neck down (and observe where the diving board is placed ), one
shaped like the Rockstar logo in which you can find a flame thrower, two
with a beach ball inside them which you can use to test the "power" or your
various guns and which blows up and fragments in an explosion and one which
has a turtle picture drawn at the bottom of it.
There are other interesting ones as well, but these are my fav.

The guy in the "Ammunation" store who sells you the guns also is wearing a
jacket which has the Rockstar logo in the top corner, check it out with a
sniper rifle for easy viewing (esp. on higher resolutions).

I'll just add that the little signs at the airport(which look like small
read and yellow prism shaped ramps on the ground) can be used to do several
good flips in a car, esp. if you're in a fast car like a Hotring racer 2
(the one with chrome bumpers) and if you come all the way from the end of
the opposite wall.