walk into an ambulance and youll get 18 haelth AND AS A BONUS FOR BEING 10% health or
under the ambulance doubles in heath

get the uzzi and when you enter the car(any kind dosen't matter) press R2+CIRCLE (RIGHT) L
TWO+CIRCLE (LEFT)

Get any car. drive to the 8-ball's autoshop. you should see a place 
w/ parked cars next to it. drive there. drive your car through the
glassed area.get in the car(there's also a hidden package in there).
drive on the side of a hooker, pick her up, take her to a alley, let the car shake, & you
get 125 health.this can also be done in a normal car, but you won't get 125 health.
P.S for each health pt. you get you lose a dollar,but if you kill the hooker you get the
money back.