As someone who drives almost everyday here...it can sometimes be difficult to figure out where you can park or not. Do not park on the road near the round about... you'll have a good chance of getting a ticket there.

The gated places where you can see the security...they'll stop & ask you why you want to visit & generally will ask your name.
The gated places where the security is not visible...honk your horn & security will let you in, once they know the reason for your visit.

The easiest way to learn where to park at random bars & restaurants without a parking lot...is to park in the closest available (looking) area...and ask the bartender, owner, waiter if where you've parked is appropriate...they'll let you know if you're good there & if not will let you know where to park.