hey there jsworldd,
Welcome to the fourms,
Well it depends on what you want to find.
If your looking for rooftops one way is to just go to apartment complexs and piggy bag on the elevator then go up the fire escape and hope that the door is unlocked for the roof (you can try wire and screwdrivers to try to get past the bolt or if you have any lock picking skills... (; ).
To find rooftops you can also go to construction sites (Much better option trust me all though theres often a bit more sec)
Jump the fence and make a b-line for the fire escape once your in you going to get to the roof.
To find drains its all about google earth/maps
Go to google maps change it to earth mode and find a lake/river then look for something that looks like a storm drain.
This is how I found most of the drains I have on my map.
(Also go to the sydney water or what evers website and look at projects)
Abandons are a bit more difficult IMO
U really need to know what your looking for.
Overflowing mailbox's overgrown gardens etc
I dont do abandos that much (dont have the time to go looking) so Ill let some one else explain how to find that kind of stuff for ya (;
and If ya ever down in melb shoot me a pm and Ill show ya around (;
Regards,
--Promethues
Defy conformity, ignite change, and shatter their doubts.